dt-bindings: clock: Update qcom,a53pll bindings for MSM8939 support

Update qcom,a53pll bindings for MSM8939 support:

 - Add optional operating-points-v2 property
 - Add MSM8939 specific compatible

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Link: https://lore.kernel.org/r/20210704024032.11559-4-shawn.guo@linaro.org
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Documentation/devicetree/bindings/clock/qcom,a53pll.yaml

@@ -18,6 +18,7 @@ properties:
     enum:
       - qcom,ipq6018-a53pll
       - qcom,msm8916-a53pll
+      - qcom,msm8939-a53pll
 
   reg:
     maxItems: 1
@@ -33,6 +34,8 @@ properties:
     items:
       - const: xo
 
+  operating-points-v2: true
+
 required:
   - compatible
   - reg