dt-bindings: counter: Convert ftm-quaddec.txt to yaml format

Convert ftm-quaddec.txt to yaml format.

Additional changes:
- Remove "status" at example.
- Remove label at example.

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

Documentation/devicetree/bindings/counter/fsl,ftm-quaddec.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/counter/fsl,ftm-quaddec.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: FlexTimer Quadrature decoder counter
+
+description:
+  Exposes a simple counter for the quadrature decoder mode.
+
+maintainers:
+  - Frank Li <[e-mail]>
+
+properties:
+  compatible:
+    const: fsl,ftm-quaddec
+
+  reg:
+    maxItems: 1
+
+  big-endian: true
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    counter@29d0000 {
+       compatible = "fsl,ftm-quaddec";
+       reg = <0x29d0000 0x10000>;
+       big-endian;
+    };

Documentation/devicetree/bindings/counter/ftm-quaddec.txt

···
-FlexTimer Quadrature decoder counter
-
-This driver exposes a simple counter for the quadrature decoder mode.
-
-Required properties:
-- compatible:		Must be "fsl,ftm-quaddec".
-- reg:			Must be set to the memory region of the flextimer.
-
-Optional property:
-- big-endian:		Access the device registers in big-endian mode.
-
-Example:
-		counter0: counter@29d0000 {
-			compatible = "fsl,ftm-quaddec";
-			reg = <0x0 0x29d0000 0x0 0x10000>;
-			big-endian;
-			status = "disabled";
-		};

MAINTAINERS

···
 M:	Patrick Havelange <[e-mail]>
 L:	[e-mail]
 S:	Maintained
-F:	Documentation/devicetree/bindings/counter/ftm-quaddec.txt
+F:	Documentation/devicetree/bindings/counter/fsl,ftm-quaddec.yaml
 F:	drivers/counter/ftm-quaddec.c
 
 FLOPPY DRIVER