boards: nordic: nrf7120pdk: Select default BT HCI and monitor UARTs

Select uart20 for the following nodes:
- zephyr,bt-c2h-uart - host communication in the HCI UART
- zephyr,bt-mon-uart - Bluetooth monitor logging

Signed-off-by: Aleksandar Stanoev <[email protected]>

Author: alexstanoev-nordic

boards/nordic/nrf7120pdk/nrf7120_cpuapp_common.dtsi

@@ -14,6 +14,8 @@
 		zephyr,console = &uart20;
 		zephyr,shell-uart = &uart20;
 		zephyr,uart-mcumgr = &uart20;
+		zephyr,bt-mon-uart = &uart20;
+		zephyr,bt-c2h-uart = &uart20;
 		zephyr,flash = &cpuapp_mram;
 		zephyr,ieee802154 = &ieee802154;
 		zephyr,wifi = &wlan0;