google/kahlee: Resume on AC insertion

The EC should wake the system from S3 when the AC connector is plugged.

BUG=b:77602394
TEST=verify resume on insert with Grunt

Change-Id: I4bcaef2fe75283aaa6260b5b9efd408ff4b05f4c
Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-on: https://review.coreboot.org/25647Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/mainboard/google/kahlee/variants/baseboard/include/baseboard/ec.h

@@ -44,10 +44,11 @@
 	(EC_HOST_EVENT_MASK(EC_HOST_EVENT_LID_OPEN)     |\
 	 EC_HOST_EVENT_MASK(EC_HOST_EVENT_POWER_BUTTON))
 
-/* EC can wake from S3 with lid or power button or key press */
+/* EC can wake from S3 with lid, power button, key press, or AC connect */
 #define MAINBOARD_EC_S3_WAKE_EVENTS \
 	(MAINBOARD_EC_S5_WAKE_EVENTS |\
-	 EC_HOST_EVENT_MASK(EC_HOST_EVENT_KEY_PRESSED))
+	 EC_HOST_EVENT_MASK(EC_HOST_EVENT_KEY_PRESSED) |\
+	 EC_HOST_EVENT_MASK(EC_HOST_EVENT_AC_CONNECTED))
 
 /* Log EC wake events plus EC shutdown events */
 #define MAINBOARD_EC_LOG_EVENTS \