arm64: dts: qcom: sm8550: Add graphics clock controller

Add device node for graphics clock controller on Qualcomm
SM8550 platform.

Signed-off-by: Jagadeesh Kona <quic_jkona@quicinc.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230524181800.28717-4-quic_jkona@quicinc.com