dt-binding: usb: xilinx: Convert binding to YAML

Convert the current udc xilinx binding from text format to YAML
format/DT schema, and delete the legacy text binding file.
Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Link: https://lore.kernel.org/r/20210826053433.1599019-1-shubhrajyoti.datta@xilinx.comSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/usb/udc-xilinx.txt

-Xilinx USB2 device controller
-
-Required properties:
-- compatible		: Should be "xlnx,usb2-device-4.00.a"
-- reg			: Physical base address and size of the USB2
-			  device registers map.
-- interrupts		: Should contain single irq line of USB2 device
-			  controller
-- xlnx,has-builtin-dma	: if DMA is included
-
-Example:
- 		axi-usb2-device@42e00000 {
-                        compatible = "xlnx,usb2-device-4.00.a";
-                        interrupts = <0x0 0x39 0x1>;
-                        reg = <0x42e00000 0x10000>;
-                        xlnx,has-builtin-dma;
-                };
-

Documentation/devicetree/bindings/usb/xlnx,usb2.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/usb/xlnx,usb2.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Xilinx udc controller
+
+maintainers:
+  - Manish Narani <manish.narani@xilinx.com>
+
+properties:
+  compatible:
+    const: xlnx,usb2-device-4.00.a
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  xlnx,has-builtin-dma:
+    description:
+      If present, hardware has dma capability.
+    type: boolean
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |
+    axi-usb2-device@42e00000 {
+        compatible = "xlnx,usb2-device-4.00.a";
+        interrupts = <0x0 0x39 0x1>;
+        reg = <0xee000000 0xc00>;
+        xlnx,has-builtin-dma;
+    };