arm64: tegra: Audio graph sound card for Jetson AGX Xavier

Enable support for audio-graph based sound card on Jetson AGX Xavier.
Following I/O interfaces are enabled.
  * I2S1, I2S2, I2S4 and I2S6
  * DMIC3
Signed-off-by: Sameer Pujar <spujar@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm64/boot/dts/nvidia/tegra194.dtsi

@@ -2351,6 +2351,26 @@ psci {
 		method = "smc";
 	};
 
+	sound {
+		status = "disabled";
+
+		clocks = <&bpmp TEGRA194_CLK_PLLA>,
+			 <&bpmp TEGRA194_CLK_PLLA_OUT0>;
+		clock-names = "pll_a", "plla_out0";
+		assigned-clocks = <&bpmp TEGRA194_CLK_PLLA>,
+				  <&bpmp TEGRA194_CLK_PLLA_OUT0>,
+				  <&bpmp TEGRA194_CLK_AUD_MCLK>;
+		assigned-clock-parents = <0>,
+					 <&bpmp TEGRA194_CLK_PLLA>,
+					 <&bpmp TEGRA194_CLK_PLLA_OUT0>;
+		/*
+		 * PLLA supports dynamic ramp. Below initial rate is chosen
+		 * for this to work and oscillate between base rates required
+		 * for 8x and 11.025x sample rate streams.
+		 */
+		assigned-clock-rates = <258000000>;
+	};
+
 	tcu: tcu {
 		compatible = "nvidia,tegra194-tcu";
 		mboxes = <&hsp_top0 TEGRA_HSP_MBOX_TYPE_SM TEGRA_HSP_SM_RX(0)>,