dt-bindings: clock: split qcom,gcc.yaml to common and specific schema

Split qcom,gcc.yaml to common and specific schema to use it as a
template for schema that needs to use the gcc bindings and require
to add additional bindings.

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Stephen Boyd <sboyd@kernel.org>
Tested-by: Jonathan McDowell <noodles@earth.li>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220226135235.10051-2-ansuelsmth@gmail.com