dt-bindings: phy-qcom-qusb2: Update binding for QUSB2 V2 version

Update generic compatible string for QUSB2 V2 PHY. This will allow
all targets using QUSB2 V2 use same string.
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>
Reviewed-by: Vivek Gautam <vivek.gautam@codeaurora.org>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

Documentation/devicetree/bindings/phy/qcom-qusb2-phy.txt

@@ -4,7 +4,10 @@ Qualcomm QUSB2 phy controller
 QUSB2 controller supports LS/FS/HS usb connectivity on Qualcomm chipsets.
 
 Required properties:
- - compatible: compatible list, contains "qcom,msm8996-qusb2-phy".
+ - compatible: compatible list, contains
+	       "qcom,msm8996-qusb2-phy" for 14nm PHY on msm8996,
+	       "qcom,qusb2-v2-phy" for QUSB2 V2 PHY.
+
  - reg: offset and length of the PHY register set.
  - #phy-cells: must be 0.