ar71xx: remove old jffs2 marker from image generation on nand targets

Signed-off-by: John Crispin <blogic@openwrt.org>

SVN-Revision: 41332

target/linux/ar71xx/image/ubinize-wndr4300.ini

@@ -15,8 +15,6 @@ vol_name=rootfs
 [rootfs_data]
 # Volume mode (other option is static)
 mode=ubi
-# Source image
-image=jffs2.eof
 # Volume ID in UBI image
 vol_id=1
 # Allow for dynamic resize
@@ -25,3 +23,4 @@ vol_type=dynamic
 vol_name=rootfs_data
 # Autoresize volume at first mount
 vol_flags=autoresize
+vol_size=1MiB