This commit unifies the `renesas,r7fa4m1ab3cfm` compatible string used in
various platforms by making it lowercase for the `arduino_uno_r4` target.
Signed-off-by: Filip Kokosinski <fkokosinski@antmicro.com>
Update documents about adding Arduino UNO R4 WiFi.
Adding a description that a debug adapter is required when
flashing and debugging.
Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>