phy: ti-pipe3: Add SATA compatible to Documentation binding

SATA PHY needs a new compatible ID. Add it to the DT binding documentation.
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

Documentation/devicetree/bindings/phy/ti-phy.txt

@@ -49,7 +49,8 @@ usb2phy@4a0ad080 {
 TI PIPE3 PHY
 
 Required properties:
- - compatible: Should be "ti,phy-usb3". "ti,omap-usb3" is deprecated.
+ - compatible: Should be "ti,phy-usb3" or "ti,phy-pipe3-sata".
+   "ti,omap-usb3" is deprecated.
  - reg : Address and length of the register set for the device.
  - reg-names: The names of the register addresses corresponding to the registers
    filled in "reg".