inclue/image.mk: fix package installation for per-device rootfs

Fixes FS#1421.

Fixes: 2fbf669730bf ("imagebuilder: reuse rootfs preparation from rootfs.mk")
Signed-off-by: Matthias Schiffer <[email protected]>

include/image.mk

@@ -18,6 +18,7 @@ ifndef IB
 endif
 
 include $(INCLUDE_DIR)/image-legacy.mk
+include $(INCLUDE_DIR)/feeds.mk
 include $(INCLUDE_DIR)/rootfs.mk
 
 override MAKE:=$(_SINGLE)$(SUBMAKE)