Refactor MMU operation code which will be reused among similar SOCs.
BUG=b:80501386
BRANCH=none
TEST=Boots correctly on Elm
Change-Id: Id8173da0a02e57e863263fcd89c91a9c089e8a0f
Signed-off-by: Tristan Shieh <tristan.shieh@mediatek.com>
Reviewed-on: https://review.coreboot.org/27349
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
