mainboard/google/poppy: Add EC_HOST_EVENT_MODE_CHANGE to wakeup source

Allow EC mode change event to wake AP up in S3.

BUG=b:35775085
BRANCH=None
TEST=Compiles successfully for poppy.

Change-Id: I6f1546c60aef6620e22cdce2fab3a2709e6556a1
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/18608
Tested-by: build bot (Jenkins)
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
1 file changed