dt-bindings: clock: qcom,gcc-msm8953: split to separate schema

The Qualcomm MSM8953 GCC clock controller has clock inputs, thus
existing gcc-other.yaml was not describing it fully.  Move the binding
to its own schema file and document the clocks based on DTS.  Add driver
contributors as its maintainers.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230408143729.84097-1-krzysztof.kozlowski@linaro.org