kernel/3.10: add a generic patch for cpu_has_mmips override

Backport of commit 3ddc14add5e6341cf8ef4058c34c67ba7fd15317
from 3.11-rc1

Suggested-by: Jonas Gorski <jogo@openwrt.org>
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@37479 3c298f89-4303-0410-b956-a3cf2f4a3e73
Revert "ar71xx: override cpu_has_mmips feature"

This reverts r37477. A generic patch is used to fix
this globally, so revert the ar71xx specific change.

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

git-svn-id: svn://svn.openwrt.org/openwrt@37480 3c298f89-4303-0410-b956-a3cf2f4a3e73