Add support for RM2 Wireless Module #18
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This PR adds initial support for the Yukon RM2 Wireless Module: https://shop.pimoroni.com/products/rm2-wireless-module-for-yukon
This build is still based on MicroPython 1.23, so is lacking the dynamic pin assignment for RM2 that should hopefully be coming in 1.25 (micropython/micropython#16057). For now this means that the RM2 Module is locked to a specific slot of Yukon (SLOT5), and you need to flash your board with specific wireless build to support it. If you wish to use the slot for another module you will need to flash your board with the non-wireless build.
To make this transition easier, I have adjusted the flash allocation of both builds to be the same, so you can switch between them without loosing the contents of your filesystem, which seems to have worked in my testing. Sadly this will require you to back up your filesystem when upgrading from Yukon 1.0.2 to 1.0.3, as your files WILL be lost otherwise.