rockchip: rock 3a: fix image check failed

Fixes the image check failed on system upgrade
  "Image check failed:
   upgrade: Device radxa,rock3a not supported by this image
   upgrade: Supported devices: radxa,rock-3a"

Signed-off-by: Tomas Lara <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/16064
Signed-off-by: Hauke Mehrtens <[email protected]>

target/linux/rockchip/image/armv8.mk

@@ -119,6 +119,7 @@ define Device/radxa_rock-3a
   DEVICE_VENDOR := Radxa
   DEVICE_MODEL := ROCK 3A
   SOC := rk3568
+  SUPPORTED_DEVICES := radxa,rock3a
   DEVICE_PACKAGES := kmod-usb-net-cdc-ncm kmod-usb-net-rndis
 endef
 TARGET_DEVICES += radxa_rock-3a