libmali: add support for multiple so-files

[Kwiboo]

This PR updates libmali to latest to add support for multiple so-files in an image.

/usr/lib/libmali.so will be linked to /var/lib/libmali/libmali.so when there is multiple .so-files installed.
libmali-setup script/service will create the /var/lib/libmali/libmali.so symlink based on gpu reported by kernel driver.

Example of libmali-setup output:

LibreELEC:~ # libmali-setup
GPUINFO: /sys/devices/platform/ffa30000.gpu/gpuinfo
GPU: Mali-T76x 4 cores r0p0 0x0750
LIB: libmali-midgard-t76x-*-r0p0-*.so
LIBMALI: /usr/lib/libmali-midgard-t76x-r14p0-r0p0-gbm.so

[MilhouseVH]

I don't understand why we are applying patches to binaries that are maintained in a LibreELEC repository - we should apply the patches "upstream" and bump the package to the version with the patched binaries.

[MilhouseVH]

OK, so once this merges then we can drop the patch. Gotit. :)

[Kwiboo]

I have dropped the EGL_MESA_platform_gbm binary patching and now use listcontains.

@kszaq for Amlogic you can now change MALI_FAMILY to be space separated instead of semicolon separated, looks better and works with listcontains.