dt-bindings: clock: Add RPMHCC bindings for SM8450

Add bindings and update documentation for clock rpmh driver on SM8450.
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211201072310.3968679-3-vkoul@kernel.org

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

@@ -27,6 +27,7 @@ properties:
       - qcom,sm8150-rpmh-clk
       - qcom,sm8250-rpmh-clk
       - qcom,sm8350-rpmh-clk
+      - qcom,sm8450-rpmh-clk
 
   clocks:
     maxItems: 1