boards: Fixing rak4631 board by making pins default to IO

Setting pins P0.09 and P0.10 as IO no longer as NFC
rak4631 uses these pins as IO and not as NFC.
See wise block schematics.
Changing the UICR inside the overlay to achieve this.

Signed-off-by: Carlo Weidinger <carlo.weidinger@protonmail.com>