Initial commit for nrf5340_audio

boards/nrf5340_audio_dk_nrf5340_cpuapp_fota.overlay

@@ -0,0 +1,39 @@
+/ {
+	chosen {
+		nordic,pm-ext-flash = &mx25r64;
+	};
+};
+
+&qspi {
+	status = "disabled";
+};
+
+&spi4 {
+	cs-gpios = <&gpio1 10 GPIO_ACTIVE_LOW>, <&gpio0 11 GPIO_ACTIVE_LOW>, <&gpio0 17 GPIO_ACTIVE_LOW>;
+	status = "okay";
+	mx25r64: mx25r6435f@0 {
+
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <8000000>;
+
+		jedec-id = [c2 28 17];
+		sfdp-bfp = [
+			e5 20 f1 ff  ff ff ff 03  44 eb 08 6b  08 3b 04 bb
+			ee ff ff ff  ff ff 00 ff  ff ff 00 ff  0c 20 0f 52
+			10 d8 00 ff  23 72 f5 00  82 ed 04 cc  44 83 68 44
+			30 b0 30 b0  f7 c4 d5 5c  00 be 29 ff  f0 d0 ff ff
+		];
+		size = <67108864>;
+		has-dpd;
+		t-enter-dpd = <10000>;
+		t-exit-dpd = <5000>;
+		dpd-wakeup-sequence = <30000 20 45000>;
+	};
+};
+
+&gpio_fwd {
+	uart {
+		gpios = < &gpio1 0x9 0x0 >, < &gpio1 0x8 0x0 >, < &gpio1 0xb 0x0 >;
+	};
+};