lantiq: fritz 7360 v2: remove additional supported devices

The additional supported device isn't required since this is a new
device. Some board contains an addtional device,
those device were supported in earlier versions which used the
"old" image builder code.
To support an sysupgrade from such old version, there is the all caps
additional device.

Signed-off-by: Alexander Couzens <lynxis@fe80.eu>
Reviewed-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

target/linux/lantiq/image/vr9.mk

@@ -133,7 +133,6 @@ define Device/avm_fritz7360-v2
   DEVICE_VARIANT := v2
   IMAGE_SIZE := 32128k
   DEVICE_PACKAGES := kmod-ath9k kmod-owl-loader wpad-basic kmod-usb-dwc2
-  SUPPORTED_DEVICES += FRITZ7360V2
 endef
 TARGET_DEVICES += avm_fritz7360-v2