dt-bindings: clock: Add sc8280xp to the RPMh clock controller binding

The Qualcomm SC8280XP has a RPMh clock controller, so add a compatible
for this to the binding.

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

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

···
       - qcom,sc7180-rpmh-clk
       - qcom,sc7280-rpmh-clk
       - qcom,sc8180x-rpmh-clk
+      - qcom,sc8280xp-rpmh-clk
       - qcom,sdm845-rpmh-clk
       - qcom,sdx55-rpmh-clk
       - qcom,sdx65-rpmh-clk