soc/apollolake: Enable/disable Audio clk and power gate in devicetree.cb

BUG=chrome-os-partner:56034

Change-Id: Id88d262b32dea468536575117fc34d52076a3096
Signed-off-by: Venkateswarlu Vinjamuri <venkateswarlu.v.vinjamuri@intel.com>
Reviewed-on: https://review.coreboot.org/16423
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/intel/apollolake/chip.h

@@ -107,6 +107,13 @@ struct soc_intel_apollolake_config {
 	/* Enable DPTF support */
 	int dptf_enable;
 
+	/* Configure Audio clk gate and power gate
+	 * IOSF-SB port ID 92 offset 0x530 [5] and [3]
+	 */
+	uint8_t hdaudio_clk_gate_enable;
+	uint8_t hdaudio_pwr_gate_enable;
+	uint8_t hdaudio_bios_config_lockdown;
+
 	/* SLP S3 minimum assertion width. */
 	int slp_s3_assertion_width_usecs;
 };