[source] mvebu: fix OpenBlocks AX3 image

[LEDE Commits]

mkresin pushed a commit to source.git, branch master:
https://git.lede-project.org/306f1c7846e3768dff51396c9dadce3956d5778f

commit 306f1c7846e3768dff51396c9dadce3956d5778f
Author: Mathias Kresin <dev at kresin.me>
AuthorDate: Sun Sep 11 19:06:32 2016 +0200

    mvebu: fix OpenBlocks AX3 image
    
    The KERNEL_SIZE variable is unset and no padding is applied. This looks
    like a typo to me since the ubinized image need to be aligned to the
    flash blocksize.
    
    Signed-off-by: Mathias Kresin <dev at kresin.me>
---
 target/linux/mvebu/image/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/linux/mvebu/image/Makefile b/target/linux/mvebu/image/Makefile
index f3eda17..7900fb9 100644
--- a/target/linux/mvebu/image/Makefile
+++ b/target/linux/mvebu/image/Makefile
@@ -141,7 +141,7 @@ define Device/openblocks-ax3
   DEVICE_DTS := armada-xp-openblocks-ax3-4
   BLOCKSIZE := 128k
   PAGESIZE := 1
-  IMAGE/factory.img := append-kernel $$$$(KERNEL_SIZE) | append-ubi
+  IMAGE/factory.img := append-kernel | pad-to $$(BLOCKSIZE) | append-ubi
   DEVICE_TITLE := Plat'Home OpenBlocks AX3
 endef
 TARGET_DEVICES += openblocks-ax3