dt-bindings: i2c: nxp,pnx-i2c: Convert to dtschema

Convert the NXP PNX I2C Controller bindings to DT schema.
Keep only one example in DT schema to remove redundancy.
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Animesh Agarwal <animeshagarwal28@gmail.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>

Documentation/devicetree/bindings/i2c/i2c-pnx.txt

-* NXP PNX I2C Controller
-
-Required properties:
-
- - reg: Offset and length of the register set for the device
- - compatible: should be "nxp,pnx-i2c"
- - interrupts: configure one interrupt line
- - #address-cells: always 1 (for i2c addresses)
- - #size-cells: always 0
-
-Optional properties:
-
- - clock-frequency: desired I2C bus clock frequency in Hz, Default: 100000 Hz
-
-Examples:
-
-	i2c1: i2c@400a0000 {
-		compatible = "nxp,pnx-i2c";
-		reg = <0x400a0000 0x100>;
-		interrupt-parent = <&mic>;
-		interrupts = <51 0>;
-		#address-cells = <1>;
-		#size-cells = <0>;
-	};
-
-	i2c2: i2c@400a8000 {
-		compatible = "nxp,pnx-i2c";
-		reg = <0x400a8000 0x100>;
-		interrupt-parent = <&mic>;
-		interrupts = <50 0>;
-		#address-cells = <1>;
-		#size-cells = <0>;
-		clock-frequency = <100000>;
-	};

Documentation/devicetree/bindings/i2c/nxp,pnx-i2c.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/i2c/nxp,pnx-i2c.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP PNX I2C Controller
+
+maintainers:
+  - Animesh Agarwal <animeshagarwal28@gmail.com>
+
+allOf:
+  - $ref: /schemas/i2c/i2c-controller.yaml#
+
+properties:
+  compatible:
+    const: nxp,pnx-i2c
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clock-frequency:
+    default: 100000
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - "#address-cells"
+  - "#size-cells"
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    i2c@400a0000 {
+        compatible = "nxp,pnx-i2c";
+        reg = <0x400a0000 0x100>;
+        interrupt-parent = <&mic>;
+        interrupts = <51 0>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+    };