drivers/serial/uart_nrfx_uarte.c Builds with warnings nrf54l20pdk/nrf54l20/cpuapp and therefore fails in twister

[aescolar]

Describe the bug
drivers/serial/uart_nrfx_uarte.c Builds with warnings nrf54l20pdk/nrf54l20/cpuapp and therefore fails in twister for at least these tests in main:

• tests/drivers/build_all/w1/drivers.w1.build
• tests/drivers/uart/uart_async_api/drivers.uart.async_api
• tests/drivers/uart/uart_async_api/drivers.uart.async_api.rtt
• tests/drivers/uart/uart_basic_api/drivers.uart.basic_api
• tests/drivers/uart/uart_basic_api/drivers.uart.basic_api.poll
• tests/drivers/uart/uart_basic_api/drivers.uart.basic_api.shell

To Reproduce

Steps to reproduce the behavior:

1. mkdir build; cd build
2. cmake -GNinja -DBOARD=nrf54l20pdk/nrf54l20/cpuapp ../tests/drivers/uart/uart_async_api
3. ninja
4. See error

Expected behavior
No build warnings & twister failures

Impact
Failing tests in main and therefore in PRs which trigger these.

Logs and console output
https://github.com/zephyrproject-rtos/zephyr/runs/32781331757

FAILED: zephyr/drivers/serial/CMakeFiles/drivers__serial.dir/uart_nrfx_uarte.c.obj 
ccache /opt/toolchains/zephyr-sdk-0.17.0/arm-zephyr-eabi/bin/arm-zephyr-eabi-gcc -DKERNEL -DK_HEAP_MEM_POOL_SIZE=0 -DNRF54L20_ENGA_XXAA -DNRF_APPLICATION -DNRF_CONFIG_CPU_FREQ_MHZ=128 -DNRF_SKIP_CLOCK_CONFIGURATION -DNRF_SKIP_GLITCHDETECTOR_DISABLE -DNRF_SKIP_TAMPC_SETUP -DPICOLIBC_LONG_LONG_PRINTF_SCANF -D__LINUX_ERRNO_EXTENSIONS__ -D__PROGRAM_START -D__ZEPHYR_SUPERVISOR__ -D__ZEPHYR__=1 -I/__w/zephyr/zephyr/twister-out/nrf54l20pdk_nrf54l20_cpuapp/tests/drivers/build_all/w1/drivers.w1.build/w1/zephyr/include/generated/zephyr -I/__w/zephyr/zephyr/include -I/__w/zephyr/zephyr/twister-out/nrf54l20pdk_nrf54l20_cpuapp/tests/drivers/build_all/w1/drivers.w1.build/w1/zephyr/include/generated -I/__w/zephyr/zephyr/soc/nordic -I/__w/zephyr/zephyr/soc/nordic/nrf54l/. -I/__w/zephyr/zephyr/soc/nordic/common/. -I/__w/zephyr/zephyr/subsys/testsuite/include -I/__w/zephyr/modules/hal/cmsis/CMSIS/Core/Include -I/__w/zephyr/zephyr/modules/cmsis/. -I/__w/zephyr/modules/hal/nordic/nrfx -I/__w/zephyr/modules/hal/nordic/nrfx/drivers/include -I/__w/zephyr/modules/hal/nordic/nrfx/mdk -I/__w/zephyr/zephyr/modules/hal_nordic/nrfx/. -isystem /__w/zephyr/zephyr/lib/libc/common/include -Wshadow -fno-strict-aliasing -Werror -Os -imacros /__w/zephyr/zephyr/twister-out/nrf54l20pdk_nrf54l20_cpuapp/tests/drivers/build_all/w1/drivers.w1.build/w1/zephyr/include/generated/zephyr/autoconf.h -fno-printf-return-value -fno-common -g -gdwarf-4 -fdiagnostics-color=always -mcpu=cortex-m33 -mthumb -mabi=aapcs -mfp16-format=ieee -mtp=soft --sysroot=/opt/toolchains/zephyr-sdk-0.17.0/arm-zephyr-eabi/arm-zephyr-eabi -imacros /__w/zephyr/zephyr/include/zephyr/toolchain/zephyr_stdint.h -Wall -Wformat -Wformat-security -Wno-format-zero-length -Wdouble-promotion -Wno-pointer-sign -Wpointer-arith -Wexpansion-to-defined -Wno-unused-but-set-variable -Werror=implicit-int -fno-pic -fno-pie -fno-asynchronous-unwind-tables -ftls-model=local-exec -fno-reorder-functions --param=min-pagesize=0 -fno-defer-pop -fmacro-prefix-map=/__w/zephyr/zephyr/tests/drivers/build_all/w1=CMAKE_SOURCE_DIR -fmacro-prefix-map=/__w/zephyr/zephyr=ZEPHYR_BASE -fmacro-prefix-map=/__w/zephyr=WEST_TOPDIR -ffunction-sections -fdata-sections -specs=picolibc.specs -std=c99 -MD -MT zephyr/drivers/serial/CMakeFiles/drivers__serial.dir/uart_nrfx_uarte.c.obj -MF zephyr/drivers/serial/CMakeFiles/drivers__serial.dir/uart_nrfx_uarte.c.obj.d -o zephyr/drivers/serial/CMakeFiles/drivers__serial.dir/uart_nrfx_uarte.c.obj -c /__w/zephyr/zephyr/drivers/serial/uart_nrfx_uarte.c
In file included from /__w/zephyr/zephyr/drivers/serial/uart_nrfx_uarte.c:15:
In function 'nrf_uarte_configure',
    inlined from 'uarte_nrfx_configure' at /__w/zephyr/zephyr/drivers/serial/uart_nrfx_uarte.c:504:2:
/__w/zephyr/modules/hal/nordic/nrfx/hal/nrf_uarte.h:877:23: error: 'uarte_cfg.frame_timeout' may be used uninitialized [-Werror=maybe-uninitialized]
  877 |                     | (uint32_t)p_cfg->frame_timeout
      |                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/__w/zephyr/zephyr/drivers/serial/uart_nrfx_uarte.c: In function 'uarte_nrfx_configure':
/__w/zephyr/zephyr/drivers/serial/uart_nrfx_uarte.c:443:28: note: 'uarte_cfg.frame_timeout' was declared here
  443 |         nrf_uarte_config_t uarte_cfg;
      |                            ^~~~~~~~~
cc1: all warnings being treated as errors
ninja: build stopped: subcommand failed.

Environment (please complete the following information):

• OS: Ubuntu 22.04 CI
• Toolchain (e.g Zephyr SDK, ...): 0.17
• Commit SHA or Version used: Main as of now

Additional context
Introduced in 1f96e62

[aescolar]

Note the HAL uses NRF_UARTE_HAS_FRAME_TIMEOUT while the drive uses UARTE_HAS_FRAME_TIMEOUT

[aescolar]

Adding an extra uart23 & uart24 in dts/common/nordic/nrf54l20.dtsi fixes it.
But, @nordic-krch is there any reason to not just use the nrfx NRF_UARTE_HAS_FRAME_TIMEOUT macro instead?