ipq806x: clear IMAGES for devices

Ensure that IMAGE-less devices won't keep the IMAGES of any previous
devices.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

SVN-Revision: 46788

target/linux/ipq806x/image/Makefile

@@ -34,6 +34,7 @@ define Device/Default
 	KERNEL_INITRAMFS_PREFIX := $$(IMG_PREFIX)-$(1)-initramfs
 	DEVICE_DTS :=
 	KERNEL_PREFIX := $$(IMAGE_PREFIX)
+	IMAGES :=
 endef
 DEVICE_VARS += DEVICE_DTS