Documentation: dt bindings: move ..usb/usb-phy.txt to ..phy/ti-phy.txt

Since now we have a separate folder for phy, move the PHY dt binding
documentation of TI to that folder.
Signed-off-by: NKishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>

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

-USB PHY
+TI PHY: DT DOCUMENTATION FOR PHYs in TI PLATFORMs
 
 OMAP USB2 PHY
 
@@ -21,10 +21,10 @@ usb2phy@4a0ad080 {
 	#phy-cells = <0>;
 };
 
-OMAP USB3 PHY
+TI PIPE3 PHY
 
 Required properties:
- - compatible: Should be "ti,omap-usb3"
+ - compatible: Should be "ti,phy-usb3". "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".
@@ -38,7 +38,7 @@ Optional properties:
 This is usually a subnode of ocp2scp to which it is connected.
 
 usb3phy@4a084400 {
-	compatible = "ti,omap-usb3";
+	compatible = "ti,phy-usb3";
 	reg = <0x4a084400 0x80>,
 	      <0x4a084800 0x64>,
 	      <0x4a084c00 0x40>;