eve: Shut down PMIC in hibernate

Instead of using EC hibernate shut down the PMIC over I2C.

This will turn off the DSW rail and the EC completely.  The existing
wake sources are still able to wake the system.

BUG=b:35647896
BRANCH=none
TEST=manual testing on Eve board to ensure that wake sources that
are expected to wake from G3 are still functional.  (AC, power, lid)

Change-Id: I91b14ec360190176dba0a8e7c458b2b0ab5b6dcd
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://chromium-review.googlesource.com/506719
Reviewed-by: Furquan Shaikh <furquan@chromium.org>
1 file changed