mvebu: fix sysupgrade from 17.04 for clearfog pro

When clearfog was renamed to clearfog pro, it broke sysupgrade from
17.04 as the new images now get rejected as incompatible. Fix this by
adding the legacy boardname to the compatible devices.

Fixes: ec4a8c6dee81 ("mvebu: ClearFog renamed upstream to ClearFog Pro")
Signed-off-by: Jonas Gorski <[email protected]>

target/linux/mvebu/image/Makefile

@@ -199,6 +199,7 @@ define Device/armada-388-clearfog-pro
   IMAGE/sdcard.img.gz := boot-scr-cfpro | boot-img | sdcard-img | gzip | append-metadata
   IMAGE_NAME = $$(IMAGE_PREFIX)-$$(2)
   DEVICE_DTS := armada-388-clearfog-pro armada-388-clearfog-base
+  SUPPORTED_DEVICES := armada-388-clearfog-pro armada-388-clearfog
 endef
 TARGET_DEVICES += armada-388-clearfog-pro