kernel/3.10: add EOF marker support to the UBI layer

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38681 3c298f89-4303-0410-b956-a3cf2f4a3e73
tools/mtd-utils: add EOF marker support to libubigen/ubinize

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38682 3c298f89-4303-0410-b956-a3cf2f4a3e73
ar71xx: image: add EOF marker to the WNDR4300 UBI image

Append EOF markers to the END of the UBI image
file. This forces the kernel to erase all blocks
after the marker even if those blocks are not
empty.

Additionally, the resulting image can be flashed
from the original web UI now, so use '-factory'
suffix for that.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38683 3c298f89-4303-0410-b956-a3cf2f4a3e73