arm64: dts: qcom: msm8996: Add Coresight support

Enable coresight support by adding device nodes for the
available source, sinks and channel blocks on msm8996.

This also adds coresight cpu debug nodes.

Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org>
Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Acked-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>