mec1322: i8042 interface

This implements i8042 keyboard interface at LPC 0x60/0x64.

BUG=chrome-os-partner:21407
TEST=Enable keyboard and keystroke from host ACPI commands. Short KSO
pins and KSI pins, and read different key codes from host.
BRANCH=None

Change-Id: Ie4e5e236bdeefd7e44974f92fcbafab5e4af2b30
Signed-off-by: Vic (Chun-Ju) Yang <victoryang@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/179940
2 files changed