ar71xx: enable sysupgrade for the OpenMesh A40

Signed-off-by: Sven Eckelmann <sven.eckelmann@open-mesh.com>

target/linux/ar71xx/base-files/lib/upgrade/openmesh.sh

@@ -42,6 +42,7 @@ platform_check_image_target_openmesh()
 
 	case "$img_board_target" in
 		A60)
+			[ "$board" = "a40" ] && return 0
 			[ "$board" = "a60" ] && return 0
 			echo "Invalid image board target ($img_board_target) for this platform: $board. Use the correct image for this platform"
 			return 1

target/linux/ar71xx/base-files/lib/upgrade/platform.sh

@@ -498,6 +498,7 @@ platform_check_image() {
 		tplink_pharos_check_image "$1" && return 0
 		return 1
 		;;
+	a40|\
 	a60|\
 	mr1750v2|\
 	mr1750|\
@@ -678,6 +679,7 @@ platform_do_upgrade() {
 	tew-673gru)
 		platform_do_upgrade_dir825b "$ARGV"
 		;;
+	a40|\
 	a60|\
 	mr1750v2|\
 	mr1750|\