mediatek/mt7622: unifi-6-lr: fix ucidef network configuration typo

There's no such thing as ucidef_set_interfaces_lan. It's
ucidef_set_interface_lan.

Cc: David Bauer <mail@david-bauer.net>
Signed-off-by: Mark Mentovai <mark@moxienet.com>

target/linux/mediatek/mt7622/base-files/etc/board.d/02_network

@@ -20,7 +20,7 @@ mediatek_setup_interfaces()
 		;;
 	ubnt,unifi-6-lr|\
 	ubnt,unifi-6-lr-ubootmod)
-		ucidef_set_interfaces_lan "eth0"
+		ucidef_set_interface_lan "eth0"
 		;;
 	*)
 		ucidef_add_switch "switch0" \