dt-bindings: clock: Add RPMHCC for SM8550

Add bindings and update documentation for clock rpmh driver on SM8550.
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230104093450.3150578-3-abel.vesa@linaro.org

Documentation/devicetree/bindings/clock/qcom,rpmhcc.yaml

@@ -31,6 +31,7 @@ properties:
       - qcom,sm8250-rpmh-clk
       - qcom,sm8350-rpmh-clk
       - qcom,sm8450-rpmh-clk
+      - qcom,sm8550-rpmh-clk
 
   clocks:
     maxItems: 1