ec_commands: Add suspend control needed for Skylake
ec_commands: Add suspend control needed for Skylake

Changes were submitted for ec_commands.h but only in the braswell tree.
Merge in ToT for future reference.

BRANCH=none
BUG=chrome-os-partner:50627
TEST=compile.

Change-Id: I74f6ce3c5fd2a628879593a65506d10c44ee574d
Signed-off-by: Gwendal Grignou <190c5a5edfcf62e0246559bf31fa7548674de3ad@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/356551

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