mb/gogle/skyrim/devicetree: enable audio coprocessor device

The ACP device on bus A device 0 function 5 wasn't enabled, so it didn't
get resources assigned. Enable the ACP device to fix this.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: Ifc9376314213e9d624756519f703d508411cb1bb
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64553
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/skyrim/variants/baseboard/devicetree.cb

@@ -119,6 +119,7 @@ chip soc/amd/sabrina
 					end
 				end
 			end
+			device ref acp on end # Audio Processor (ACP)
 		end
 		device ref gpp_bridge_c on  # Internal GPP Bridge 2 to Bus C
 			device ref xhci_2 on # USB 2.0 (USB2)