dt-bindings: clock: provide separate bindings for qcom,gcc-mdm9615

The global clock controller on MDM9615 uses external CXO and PLL7
clocks. Split the qcom,gcc-mdm9615 to the separate schema file.

Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Dmitry Baryshkov <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Bjorn Andersson <[e-mail]>

Documentation/devicetree/bindings/clock/qcom,gcc-other.yaml

···
     include/dt-bindings/reset/qcom,gcc-ipq6018.h
     include/dt-bindings/clock/qcom,gcc-msm8953.h
     include/dt-bindings/clock/qcom,gcc-mdm9607.h
-    include/dt-bindings/clock/qcom,gcc-mdm9615.h
-    include/dt-bindings/reset/qcom,gcc-mdm9615.h
 
 allOf:
   - $ref: qcom,gcc.yaml#
···
     enum:
       - qcom,gcc-ipq6018
       - qcom,gcc-mdm9607
-      - qcom,gcc-mdm9615
 
 required:
   - compatible