boards: arm: nrf5340_audio_dk_nrf5340: add codec iface gpio hogs

The nRF5340 Audio DK provides a multiplexer circuit that allows to
interface the audio codec by an external master. Use GPIO hogs to
initialize the multiplexers correctly.

Signed-off-by: Gerard Marull-Paretas <[email protected]>

Author: gmarull

boards/arm/nrf5340_audio_dk_nrf5340/nrf5340_audio_dk_nrf5340_cpuapp_common.dtsi

@@ -112,6 +112,13 @@
 
 &gpio0 {
 	status = "okay";
+
+	codec-interface {
+		gpio-hog;
+		gpios = <21 GPIO_ACTIVE_HIGH>;
+		/* low output to select on-board codec control */
+		output-low;
+	};
 };
 
 &gpio1 {