snappy: Lock EC and PD communication
snappy: Lock EC and PD communication

Follow reef setting

BUG=none
BRANCH=reef
TEST=make buildall

Change-Id: I51fb9aa17d5d9eaf15d54df9f45db12b503b31b9
Signed-off-by: Bruce.Wan <a898a81068da7266439365c3bd380deb6a0a895f@quantatw.com>
Reviewed-on: https://chromium-review.googlesource.com/444591
Commit-Ready: Daisuke Nojiri <fd5f93af191bf7e8f73ea71cc3c0f66b41b1dd49@chromium.org>
Tested-by: Daisuke Nojiri <fd5f93af191bf7e8f73ea71cc3c0f66b41b1dd49@chromium.org>
Reviewed-by: Daisuke Nojiri <fd5f93af191bf7e8f73ea71cc3c0f66b41b1dd49@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec