dt-bindings: clock: Add YAML schemas for the QCOM GCC clock bindings

The GCC clock provider have a bunch of generic properties that
are needed in a device tree. Add a YAML schemas for those.

Signed-off-by: Taniya Das <tdas@codeaurora.org>
Link: https://lkml.kernel.org/r/20191014102308.27441-4-tdas@codeaurora.org


Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>