build: add image command for CE images

Combined Extended Images V1 can be created easily via the new image
commands using

    IMAGE/sysupgrade.bin/squashfs := append-rootfs | pad-rootfs | combined-ext-image

Signed-off-by: Sven Eckelmann <sven.eckelmann@open-mesh.com>

include/image-commands.mk

@@ -229,6 +229,19 @@ define Build/combined-image
 	@mv $@.new $@
 endef
 
+define Build/openmesh-image
+	$(TOPDIR)/scripts/om-fwupgradecfg-gen.sh \
+		"$(call param_get_default,ce_type,$(1),$(DEVICE_NAME))" \
+		"$@-fwupgrade.cfg" \
+		"$(call param_get_default,kernel,$(1),$(IMAGE_KERNEL))" \
+		"$(call param_get_default,rootfs,$(1),$@)"
+	$(TOPDIR)/scripts/combined-ext-image.sh \
+		"$(call param_get_default,ce_type,$(1),$(DEVICE_NAME))" "$@" \
+		"$@-fwupgrade.cfg" "fwupgrade.cfg" \
+		"$(call param_get_default,kernel,$(1),$(IMAGE_KERNEL))" "kernel" \
+		"$(call param_get_default,rootfs,$(1),$@)" "rootfs"
+endef
+
 define Build/sysupgrade-tar
 	sh $(TOPDIR)/scripts/sysupgrade-tar.sh \
 		--board $(if $(BOARD_NAME),$(BOARD_NAME),$(DEVICE_NAME)) \