image: append-ubi: add optional UBI subpage size

Signed-off-by: Claudio Leite <leitec@staticky.com>

SVN-Revision: 47411

include/image.mk

@@ -384,7 +384,8 @@ define Build/append-ubi
 		$(if $(KERNEL_IN_UBI),--kernel $(word 1,$^)) \
 		$(word 2,$^) \
 		$@.tmp \
-		-p $(BLOCKSIZE) -m $(PAGESIZE) -E 5
+		-p $(BLOCKSIZE) -m $(PAGESIZE) -E 5 \
+		$(if $(SUBPAGESIZE),-s $(SUBPAGESIZE))
 	cat $@.tmp >> $@
 	rm $@.tmp
 endef