dt-bindings: arm: pmu: Document Denver and Carmel PMUs

Add compatible strings for the NVIDIA Denver and Carmel PMUs.

Signed-off-by: Thierry Reding <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Rob Herring <[e-mail]>

Documentation/devicetree/bindings/arm/pmu.yaml

···
           - arm,neoverse-v1-pmu
           - brcm,vulcan-pmu
           - cavium,thunder-pmu
+          - nvidia,denver-pmu
+          - nvidia,carmel-pmu
           - qcom,krait-pmu
           - qcom,scorpion-pmu
           - qcom,scorpion-mp-pmu