dt-bindings: phy: remove qcom-dwc3-usb-phy

This binding is not used by any driver.
Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
Cc: Jorge Ramirez-Ortiz <jorge.ramirez.ortiz@gmail.com>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

Documentation/devicetree/bindings/phy/qcom-dwc3-usb-phy.txt

-Qualcomm DWC3 HS AND SS PHY CONTROLLER
---------------------------------------
-
-DWC3 PHY nodes are defined to describe on-chip Synopsis Physical layer
-controllers.  Each DWC3 PHY controller should have its own node.
-
-Required properties:
-- compatible: should contain one of the following:
-	- "qcom,dwc3-hs-usb-phy" for High Speed Synopsis PHY controller
-	- "qcom,dwc3-ss-usb-phy" for Super Speed Synopsis PHY controller
-- reg: offset and length of the DWC3 PHY controller register set
-- #phy-cells: must be zero
-- clocks: a list of phandles and clock-specifier pairs, one for each entry in
-  clock-names.
-- clock-names: Should contain "ref" for the PHY reference clock
-
-Optional clocks:
-  "xo"		External reference clock
-
-Example:
-		phy@100f8800 {
-			compatible = "qcom,dwc3-hs-usb-phy";
-			reg = <0x100f8800 0x30>;
-			clocks = <&gcc USB30_0_UTMI_CLK>;
-			clock-names = "ref";
-			#phy-cells = <0>;
-
-		};
-
-		phy@100f8830 {
-			compatible = "qcom,dwc3-ss-usb-phy";
-			reg = <0x100f8830 0x30>;
-			clocks = <&gcc USB30_0_MASTER_CLK>;
-			clock-names = "ref";
-			#phy-cells = <0>;
-
-		};