dt-bindings: cpufreq: cpufreq-qcom-hw: add SDM670 compatible

The bindings for Qualcomm CPU frequency have a compatible for each SoC.
Add the compatible for SDM670.

Fixes: 0c665213 ("arm64: dts: qcom: sdm670: add cpu frequency scaling")
Signed-off-by: Richard Acayan <mailingradian@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

Documentation/devicetree/bindings/cpufreq/cpufreq-qcom-hw.yaml

@@ -23,6 +23,7 @@ properties:
           - enum:
               - qcom,qcm2290-cpufreq-hw
               - qcom,sc7180-cpufreq-hw
+              - qcom,sdm670-cpufreq-hw
               - qcom,sdm845-cpufreq-hw
               - qcom,sm6115-cpufreq-hw
               - qcom,sm6350-cpufreq-hw
@@ -128,6 +129,7 @@ allOf:
               - qcom,qdu1000-cpufreq-epss
               - qcom,sc7180-cpufreq-hw
               - qcom,sc8280xp-cpufreq-epss
+              - qcom,sdm670-cpufreq-hw
               - qcom,sdm845-cpufreq-hw
               - qcom,sm6115-cpufreq-hw
               - qcom,sm6350-cpufreq-hw