mb/gogle/skyrim/devicetree: enable display HDA device

The HD audio controller of the GPU on bus A device 0 function 1 wasn't
enabled, so it didn't get resources assigned. Enable it to fix this.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: Ib9a4129ce594c5dd59f70e855fef5f2c04ebb9c1
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64554
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/google/skyrim/variants/baseboard/devicetree.cb b/src/mainboard/google/skyrim/variants/baseboard/devicetree.cb
index 1a06b77..8b0ec3f 100644
--- a/src/mainboard/google/skyrim/variants/baseboard/devicetree.cb
+++ b/src/mainboard/google/skyrim/variants/baseboard/devicetree.cb
@@ -72,6 +72,7 @@
 
 		device ref gpp_bridge_a on  # Internal GPP Bridge 0 to Bus A
 			device ref gfx on end # Internal GPU (GFX)
+			device ref gfx_hda on end # Display HD Audio Controller (GFXAZ)
 			device ref crypto on end # Crypto Coprocessor
 			device ref xhci_0 on # USB 3.1 (USB0)
 				chip drivers/usb/acpi