dt-bindings: net: convert maxim,ds26522.txt to yaml format

Convert binding doc maxim,ds26522.txt to yaml format.
Additional changes
- Remove spi-max-frequency because ref to
/schemas/spi/spi-peripheral-props.yaml
- Add address-cells and size-cells in example

Fix below warning:
arch/arm64/boot/dts/freescale/fsl-ls1043a-rdb.dtb: /soc/spi@2100000/slic@2: failed to match any schema with compatible: ['maxim,ds26522']

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240809143208.3447888-1-Frank.Li@nxp.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>

Documentation/devicetree/bindings/net/maxim,ds26522.txt

@@ -1,13 +0,0 @@
-* Maxim (Dallas) DS26522 Dual T1/E1/J1 Transceiver
-
-Required properties:
-- compatible: Should contain "maxim,ds26522".
-- reg: SPI CS.
-- spi-max-frequency: SPI clock.
-
-Example:
-	slic@1 {
-		compatible = "maxim,ds26522";
-		reg = <1>;
-		spi-max-frequency = <2000000>; /* input clock */
-	};

Documentation/devicetree/bindings/net/maxim,ds26522.yaml

@@ -0,0 +1,40 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/maxim,ds26522.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Maxim (Dallas) DS26522 Dual T1/E1/J1 Transceiver
+
+maintainers:
+  - Frank Li <Frank.Li@nxp.com>
+
+properties:
+  compatible:
+    items:
+      - const: maxim,ds26522
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        transceiver@1 {
+            compatible = "maxim,ds26522";
+            reg = <1>;
+            spi-max-frequency = <2000000>; /* input clock */
+        };
+    };