dt-bindings: nvmem: convert zii,rave-sp-eeprom.txt to yaml format

Convert device tree binding doc zii,rave-sp-eeprom.txt to yaml format.
Additional changes:
- Add ref to nvme.yaml.
- Add reg property.
- Remove mfd at example.

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

Documentation/devicetree/bindings/nvmem/zii,rave-sp-eeprom.txt

···
-Zodiac Inflight Innovations RAVE EEPROM Bindings
-
-RAVE SP EEPROM device is a "MFD cell" device exposing physical EEPROM
-attached to RAVE Supervisory Processor. It is expected that its Device
-Tree node is specified as a child of the node corresponding to the
-parent RAVE SP device (as documented in
-Documentation/devicetree/bindings/mfd/zii,rave-sp.txt)
-
-Required properties:
-
-- compatible: Should be "zii,rave-sp-eeprom"
-
-Optional properties:
-
-- zii,eeprom-name: Unique EEPROM identifier describing its function in the
-  system. Will be used as created NVMEM deivce's name.
-
-Data cells:
-
-Data cells are child nodes of eerpom node, bindings for which are
-documented in Documentation/devicetree/bindings/nvmem/nvmem.txt
-
-Example:
-
-	rave-sp {
-		compatible = "zii,rave-sp-rdu1";
-		current-speed = <38400>;
-
-		eeprom@a4 {
-			compatible = "zii,rave-sp-eeprom";
-			reg = <0xa4 0x4000>;
-			#address-cells = <1>;
-			#size-cells = <1>;
-			zii,eeprom-name = "main-eeprom";
-
-			wdt_timeout: wdt-timeout@81 {
-				reg = <0x81 2>;
-			};
-		};
-	}

Documentation/devicetree/bindings/nvmem/zii,rave-sp-eeprom.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/nvmem/zii,rave-sp-eeprom.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Zodiac Inflight Innovations RAVE EEPROM
+
+maintainers:
+  - Frank Li <[e-mail]>
+
+description:
+  RAVE SP EEPROM device is a "MFD cell" device exposing physical EEPROM
+  attached to RAVE Supervisory Processor. It is expected that its Device
+  Tree node is specified as a child of the node corresponding to the
+  parent RAVE SP device (as documented in
+  Documentation/devicetree/bindings/mfd/zii,rave-sp.yaml)
+
+properties:
+  compatible:
+    const: zii,rave-sp-eeprom
+
+  reg:
+    maxItems: 1
+
+  zii,eeprom-name:
+    $ref: /schemas/types.yaml#/definitions/string
+    description:
+      Unique EEPROM identifier describing its function in the
+      system. Will be used as created NVMEM deivce's name.
+
+required:
+  - compatible
+
+allOf:
+  - $ref: nvmem.yaml#
+  - $ref: nvmem-deprecated-cells.yaml#
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    eeprom@a4 {
+        compatible = "zii,rave-sp-eeprom";
+        reg = <0xa4 0x4000>;
+        #address-cells = <1>;
+        #size-cells = <1>;
+        zii,eeprom-name = "main-eeprom";
+
+        wdt-timeout@81 {
+            reg = <0x81 2>;
+        };
+    };
+