Refactor PMIC wrapper code which will be reused among similar SoCs.
Move reusable code into the common folder.
BUG=b:80501386
BRANCH=none
TEST=emerge-elm coreboot
Change-Id: I25acb6da49e72748d856804ef4f97e9ec3bef72d
Signed-off-by: Tristan Shieh <tristan.shieh@mediatek.com>
Reviewed-on: https://review.coreboot.org/29420
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
