google/kahlee: Add EC and GNVS ACPI

Add ACPI support for the Google EC, which requires GNVS support
for passing information from the EC to firmware and OS.

Change-Id: I0a308bcd608a135cc9633273a05527f020b60743
Signed-off-by: Marc Jones <marc.jones@scarletltd.com>
Reviewed-on: https://review.coreboot.org/20276
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
3 files changed