mb/google/poppy: Set S0ix lazy wake mask

Enable S0ix wake mask programming from coreboot using unified host event
programming interface. Lazy s0ix wake mask helps to configure s0ix wake
mask during boot and EC sets the wake mask during S0ix entry.

BRANCH=none
BUG=b:63969337
TEST=verify masks with ec hostevent command on S0,S3,S5 and S0ix

Change-Id: I65173104fce258d03956bbb0e80073c47fe80fab
Signed-off-by: Jenny TC <jenny.tc@intel.com>
Reviewed-on: https://review.coreboot.org/21086
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/mainboard/google/poppy/ec.c

@@ -25,6 +25,7 @@ void mainboard_ec_init(void)
 		.sci_events = MAINBOARD_EC_SCI_EVENTS,
 		.s3_wake_events = MAINBOARD_EC_S3_WAKE_EVENTS,
 		.s5_wake_events = MAINBOARD_EC_S5_WAKE_EVENTS,
+		.s0ix_wake_events = MAINBOARD_EC_S0IX_WAKE_EVENTS,
 	};
 
 	google_chromeec_events_init(&info, acpi_is_wakeup_s3());