arm64: dts: qcom: sc7180: Update lpass cpu node for audio over dp

Updaate lpass dts node with HDMI reg, interrupt and iommu
for supporting audio over dp.

Signed-off-by: V Sujith Kumar Reddy <vsujithk@codeaurora.org>
Signed-off-by: Srinivasa Rao Mandadapu <srivasam@qti.qualcomm.com>
Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20210721080549.28822-2-srivasam@qti.qualcomm.com
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>