arm64: dts: qcom: qrb5165-rb5: add HDMI audio playback

Add support for audio output over the HDMI output using Tertiary I2S
and LT9611UXC DSI-to-HDMI bridge.
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20210115024713.92574-1-dmitry.baryshkov@linaro.orgSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

arch/arm64/boot/dts/qcom/qrb5165-rb5.dts

@@ -697,6 +697,7 @@ &sound {
 		"VA DMIC0", "vdd-micb",
 		"VA DMIC1", "vdd-micb",
 		"MM_DL1",  "MultiMedia1 Playback",
+		"MM_DL2",  "MultiMedia2 Playback",
 		"MultiMedia3 Capture", "MM_UL3";
 
 	mm1-dai-link {
@@ -706,6 +707,13 @@ cpu {
 		};
 	};
 
+	mm2-dai-link {
+		link-name = "MultiMedia2";
+		cpu {
+			sound-dai = <&q6asmdai  MSM_FRONTEND_DAI_MULTIMEDIA2>;
+		};
+	};
+
 	mm3-dai-link {
 		link-name = "MultiMedia3";
 		cpu {
@@ -713,6 +721,21 @@ cpu {
 		};
 	};
 
+	hdmi-dai-link {
+		link-name = "HDMI Playback";
+		cpu {
+			sound-dai = <&q6afedai TERTIARY_MI2S_RX>;
+		};
+
+		platform {
+			sound-dai = <&q6routing>;
+		};
+
+		codec {
+			sound-dai =  <&lt9611_codec 0>;
+		};
+	};
+
 	dma-dai-link {
 		link-name = "WSA Playback";
 		cpu {