dt-bindings: cpufreq: cpufreq-qcom-hw: document interrupts

The Qualcomm Soc cpufreq hardware engine has LMh/thermal throttling
interrupts (already present in SM8250 and SM8450 DTS) and Linux driver
uses them:

  sm8250-hdk.dtb: cpufreq@18591000: 'interrupt-names', 'interrupts' do not match any of the regexes: 'pinctrl-[0-9]+'
  sm8450-qrd.dtb: cpufreq@17d91000: 'interrupt-names', 'interrupts' do not match any of the regexes: 'pinctrl-[0-9]+'
Signed-off-by: NKrzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: NViresh Kumar <viresh.kumar@linaro.org>

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

@@ -54,6 +54,17 @@ properties:
       - const: xo
       - const: alternate
 
+  interrupts:
+    minItems: 1
+    maxItems: 3
+
+  interrupt-names:
+    minItems: 1
+    items:
+      - const: dcvsh-irq-0
+      - const: dcvsh-irq-1
+      - const: dcvsh-irq-2
+
   '#freq-domain-cells':
     const: 1