dt-bindings: clock: add rpmhcc bindings for sdm670

The Snapdragon 670 uses the RPMh mailbox for some clocks. Document its
support.
Signed-off-by: Richard Acayan <mailingradian@gmail.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220920223734.151135-2-mailingradian@gmail.com

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

@@ -21,6 +21,7 @@ properties:
       - qcom,sc7280-rpmh-clk
       - qcom,sc8180x-rpmh-clk
       - qcom,sc8280xp-rpmh-clk
+      - qcom,sdm670-rpmh-clk
       - qcom,sdm845-rpmh-clk
       - qcom,sdx55-rpmh-clk
       - qcom,sdx65-rpmh-clk