stoneyridge: Store wake parameters in NVS

ACPI _SWS needs information on PM1 and ACPI events (though events can be
read directly). Unfortunately PM1 is cleared in normal path and in resume
path. Save PM1 and ACPI events in NVS to be accessed by ACPI _SWS.

BUG=b:75996437
TEST=Build and boot grunt recording serial. Run suspend stress test, after
3 resumes closed file and examined for the message indicating what was
being saved to NVS. Two different path, normal boot (first boot) and
resume path had different PM1.

Change-Id: If3b191854afb27779b47c3d8d9f5671a255f51b5
Signed-off-by: Richard Spiegel <richard.spiegel@silverbackltd.com>
Reviewed-on: https://review.coreboot.org/26208
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Martin Roth <martinroth@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/amd/stoneyridge/acpi.c

@@ -281,6 +281,7 @@ static void acpi_create_gnvs(struct global_nvs_t *gnvs)
 
 	/* Set unknown wake source */
 	gnvs->pm1i = ~0ULL;
+	gnvs->gpei = ~0ULL;
 
 	/* CPU core count */
 	gnvs->pcnt = dev_count_cpu();