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.org


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>