ar71xx: ap81: define mtd layout via command line

Also use the RKuImage macro becasue the original
firmware starts with the rootfs.

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@39378 3c298f89-4303-0410-b956-a3cf2f4a3e73
ar71xx: ap83: define mtd layout via command line

Also use the RKuImage macro becasue the original
firmware starts with the rootfs.

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@39379 3c298f89-4303-0410-b956-a3cf2f4a3e73