CHROMIUM: mfd: chromeos_ec: update EC<->AP protocol

CHROMIUM: mfd: chromeos_ec: update EC<->AP protocol

we switch to a common protocol for all platforms.
This will allow us to support flashing commands.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>
BUG=chrome-os-partner:9614
TEST=on Daisy, test keyboard input in ChromeOS with new EC.

Change-Id: If5304fabffaa932304bbe7ba1e21d5ee653a2c96
Reviewed-on: https://gerrit-int.chromium.org/17855
Reviewed-by: Luigi Semenzato <semenzato@google.com>
Commit-Ready: Vincent Palatin <vpalatin@chromium.org>
Tested-by: Vincent Palatin <vpalatin@chromium.org>