dt-bindings: phy: Convert marvell,berlin2-usb-phy to DT schema

Convert the Marvell Berlin2 USB PHY binding to DT schema format. It's a
straight forward conversion.

Signed-off-by: Rob Herring (Arm) <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

Documentation/devicetree/bindings/phy/berlin-usb-phy.txt

···
-* Marvell Berlin USB PHY
-
-Required properties:
-- compatible: "marvell,berlin2-usb-phy" or "marvell,berlin2cd-usb-phy"
-- reg: base address and length of the registers
-- #phys-cells: should be 0
-- resets: reference to the reset controller
-
-Example:
-
-	usb-phy@f774000 {
-		compatible = "marvell,berlin2-usb-phy";
-		reg = <0xf774000 0x128>;
-		#phy-cells = <0>;
-		resets = <&chip 0x104 14>;
-	};

Documentation/devicetree/bindings/phy/marvell,berlin2-usb-phy.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/phy/marvell,berlin2-usb-phy.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Marvell Berlin USB PHY
+
+maintainers:
+  - Antoine Tenart <[e-mail]>
+
+properties:
+  compatible:
+    enum:
+      - marvell,berlin2-usb-phy
+      - marvell,berlin2cd-usb-phy
+
+  reg:
+    maxItems: 1
+
+  "#phy-cells":
+    const: 0
+
+  resets:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - "#phy-cells"
+  - resets
+
+additionalProperties: false
+
+examples:
+  - |
+    usb-phy@f774000 {
+      compatible = "marvell,berlin2-usb-phy";
+      reg = <0xf774000 0x128>;
+      #phy-cells = <0>;
+      resets = <&chip 0x104 14>;
+    };