ec/google/chromeec: Handle ACPI S4 in chromeec_smi_sleep()

While Chromebook hardware originally would not have the
capacity to do suspend-to-disk (ACPI S4), the power management
code in EC should react to S4 request as if it was S5 request.

Change-Id: Ida9118919c8149d94f470847d0c4aad9c0b97d3e
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74823
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

src/ec/google/chromeec/smihandler.c

@@ -53,6 +53,7 @@ void chromeec_smi_sleep(int slp_type, uint64_t s3_mask, uint64_t s5_mask)
 			/* Enable wake events */
 			google_chromeec_set_wake_mask(s3_mask);
 			break;
+		case ACPI_S4:
 		case ACPI_S5:
 			/* Enable wake events */
 			google_chromeec_set_wake_mask(s5_mask);