RAK4631 QoL updates

[jacobeva]

This PR is related to https://github.com/markqvist/Reticulum/pull/502

Added:

• RAK4631 firmware hash calculation support!
• RAK4631 product and model identifiers
• Hard reset functionality for NRF52 (and naturally the RAK4631)

Fixes:

• Fixed EEPROM lock not being set in some cases
• Renamed RAK4631 from RAK4630
• Reverted HAS_DISPLAY define in RAK4631 board config to false. It should remain this way until I submit my e-ink PR, otherwise it will give compilation errors.
• Fixed RAK4631 not executing sketch until connected over serial

Comments are welcome as always. If I have gone about something the wrong way, please let me know Mark!

[jacobeva]

Reverted HAS_DISPLAY define in RAK4631 board config to false.

This actually wasn't necessary, as it does not cause compilation errors as I expected. It can be removed if you wish!

[jacobeva]

cda32c405fd8c9b73d7abc0de414dae0c198c44d fixes an issue with transmission power on the RAK4631. Basically I wasn't using the DIO2 pin for the TX/RX switch despite having programmed it into the driver. d'oh!