dt-bindings: clock: Add Qcom SM8350 GPUCC bindings

Add device tree bindings for graphics clock controller for
Qualcomm Technology Inc's SM8350 SoCs.

Signed-off-by: Robert Foss <robert.foss@linaro.org>
Reviewed-by: Dmitry Baryshkov <dmityr.baryshkov@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220706154337.2026269-2-robert.foss@linaro.org