soc/intel/apollolake/acpi/pch_hda: Add _PRW for HD-A

Add GPE in _PRW for wake from S3 for HD-audio controller

Change-Id: I6ad289be8c58e48ad0ec9d2ee0894fe16b8f2e1c
Signed-off-by: Hannah Williams <hannah.williams@intel.com>
Reviewed-on: https://review.coreboot.org/22637
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/soc/intel/apollolake/acpi/pch_hda.asl

@@ -34,6 +34,9 @@ Device (HDAS)
 		}
 	)
 
+	/* can wake up from S3 state */
+	Name (_PRW, Package() { GPE0A_AVS_PME_STS, 3 })
+
 	/*
 	 * Device Specific Method
 	 * Arg0 - UUID