dietpi-patches: switch UART node when migrating to Rockchip mainline kernel

The Rockchip vendor kernel provides `/dev/ttyFIQ0` for the primary/debug UART console, mainline Linux provides `/dev/ttyS2` instead. Switch the node accordingly, to keep boot/kernel output and login prompt on the serial console functional.

Author: MichaIng

.update/patches

@@ -2085,6 +2085,12 @@ Patch_9_20()
 		# The /boot/dtb symlink has been found to be missing after kernel removed, despite a newer kernel being installed already. Assure it is present and correct.
 		[[ -d '/boot/dtb' ]] || G_EXEC_OUTPUT=1 G_EXEC dpkg-reconfigure -f noninteractive linux-image-current-rockchip64
 		G_EXEC_OUTPUT=1 G_EXEC /boot/dietpi/func/dietpi-set_hardware flash-u-boot-mmc
+		G_EXEC sed --follow-symlinks -i 's/ttyFIQ0/ttyS2/' /boot/dietpiEnv.txt
+		if systemctl -q is-enabled serial-getty@ttyFIQ0
+		then
+			G_EXEC_OUTPUT=1 G_EXEC /boot/dietpi/func/dietpi-set_hardware serialconsole 0 ttyFIQ0
+			G_EXEC_OUTPUT=1 G_EXEC /boot/dietpi/func/dietpi-set_hardware serialconsole 1 ttyS2
+		fi
 	fi
 
 	G_DIETPI-NOTIFY 2 'Masking unnecessary systemd-firstboot service'
@@ -2240,6 +2246,12 @@ Patch_10_1()
 		# The /boot/dtb symlink has been found to be missing after kernel removed, despite a newer kernel being installed already. Assure it is present and correct.
 		[[ -d '/boot/dtb' ]] || G_EXEC_OUTPUT=1 G_EXEC dpkg-reconfigure -f noninteractive linux-image-current-rockchip64
 		G_EXEC_OUTPUT=1 G_EXEC /boot/dietpi/func/dietpi-set_hardware flash-u-boot-mmc
+		G_EXEC sed --follow-symlinks -i 's/ttyFIQ0/ttyS2/' /boot/dietpiEnv.txt
+		if systemctl -q is-enabled serial-getty@ttyFIQ0
+		then
+			G_EXEC_OUTPUT=1 G_EXEC /boot/dietpi/func/dietpi-set_hardware serialconsole 0 ttyFIQ0
+			G_EXEC_OUTPUT=1 G_EXEC /boot/dietpi/func/dietpi-set_hardware serialconsole 1 ttyS2
+		fi
 
  	# NanoPi R5C
 	elif (( $G_HW_MODEL == 76 )) && grep -q 'R5C' /proc/device-tree/model