intel/apollolake: Add support to enable google ChromeEC

ChromeEC is needed for EC controlled features to work properly.
This patch adds neccessary support in soc/intel so that mainboard
asl files can include the ChromeEC e.g. PNOT method and
LPCB and also the nvs fields.

BUG = 53096
TEST = This patch is needed by the mainboard specific ASL change to include
       src/ec/google/chromeec/acpi/ec.asl

Change-Id: Icecc437df05cd3efb41579317a353fd22526e0c9
Signed-off-by: Shaunak Saha <shaunak.saha@intel.com>
Reviewed-on: https://review.coreboot.org/14967
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
5 files changed