image.mk: add Build step combined-image

Signed-off-by: Alexander Couzens <[email protected]>

SVN-Revision: 45979

include/image.mk

@@ -326,6 +326,13 @@ define Build/check-size
 	}
 endef
 
+define Build/combined-image
+	-sh $(TOPDIR)/scripts/combined-image.sh \
+		"$(word 1,$^)" \
+		"$@" \
+		"[email protected]"
+	@mv [email protected] $@
+endef
 
 define Device/Init
   PROFILES := $(PROFILE)