ramips: enforce image metadata verification

Now that we got rid of all legacy images, we can enforce image metadata
verification.

Signed-off-by: Mathias Kresin <[email protected]>

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

@@ -3,6 +3,7 @@
 #
 
 PART_NAME=firmware
+REQUIRE_IMAGE_METADATA=1
 
 platform_check_image() {
 	local board=$(board_name)