cr50: Make EC clear AP_OFF before hibnernate

This patch makes AP send EC_REBOOT_HIBERNATE_CLEAR_AP_OFF, which makes
EC clear AP_OFF flag then hibernate.

This is needed to make Chromebox boot when cr50 toggles the EC's reset
line after TURN_UPDATE_ON command.

BUG=b:69721737
BRANCH=none
CQ-DEPEND=CL:802632
TEST=Verify Fizz reboot after cr50 update.

Change-Id: I5f590286393ac21382cab64afdccae92d3fc14ba
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-on: https://review.coreboot.org/22657
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
2 files changed