arm64: dts: qcom: msm8996: add #clock-cells and XO clock to the HDMI PHY node

Add #clock-cells property to the HDMI PHY device node to let other nodes
resolve the hdmipll clock. While we are at it, also add the XO clock to
the device node.

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220704161148.814510-4-dmitry.baryshkov@linaro.org