ACPI: Add acpi_reset_gnvs_for_wake()

With chipset_power_state filled in romstage CBMEM hooks and
GNVS allocated early in ramstage, GNVS wake source is now
also filled for normal boot path.

Change-Id: I2d44770392d14d2d6e22cc98df9d1751c8717ff3
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50004
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

src/acpi/gnvs.c

@@ -92,3 +92,16 @@ void acpi_fill_gnvs(void)
 		acpigen_pop_len();
 	}
 }
+
+int acpi_reset_gnvs_for_wake(struct global_nvs **gnvs_)
+{
+	if (!gnvs)
+		return -1;
+
+	/* Set unknown wake source */
+	gnvs->pm1i = -1;
+	gnvs->gpei = -1;
+
+	*gnvs_ = gnvs;
+	return 0;
+}