mediatek: add mt7629 subtarget with rfb image

base-files are added into subtarget directory like what's done
recently in ath79. For this subtarget, metadata checks are enforced
and a SUPPORTED_DEVICE is added to generate proper metadata.
Since we only have mt7629 support in 4.19, override KERNEL_PATCHVER
in target.mk for now.

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>

target/linux/mediatek/mt7629/base-files/etc/board.d/02_network

@@ -0,0 +1,34 @@
+#!/bin/sh
+
+. /lib/functions.sh
+. /lib/functions/uci-defaults.sh
+. /lib/functions/system.sh
+
+mediatek_setup_interfaces()
+{
+	local board="$1"
+
+	case $board in
+	mediatek,mt7629-lynx-rfb)
+		ucidef_set_interfaces_wan "eth1"
+		ucidef_add_switch "switch0" \
+			"0:lan" "1:lan" "2:lan" "3:lan" "6@eth0"
+		;;
+	esac
+}
+
+mediatek_setup_macs()
+{
+	local board="$1"
+
+	case $board in
+	esac
+}
+
+board_config_update
+board=$(board_name)
+mediatek_setup_interfaces $board
+mediatek_setup_macs $board
+board_config_flush
+
+exit 0