dt-bindings: clk: qcom: Add bindings for MSM8994 GCC driver

Add documentation for the MSM8994 GCC driver. While at it, retire its
compatible from the old, everyone-get-in-here file.

Signed-off-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Link: https://lore.kernel.org/r/20210923162645.23257-1-konrad.dybcio@somainline.org


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