dt-bindings: arm: Convert SPEAr board/soc bindings to json-schema

Convert SPEAr SoC bindings to DT schema format using json-schema.

Cc: Shiraz Hashim <shiraz.linux.kernel@gmail.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: devicetree@vger.kernel.org
Acked-by: NViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: NRob Herring <robh@kernel.org>

Documentation/devicetree/bindings/arm/spear.txt

-ST SPEAr Platforms Device Tree Bindings
----------------------------------------
-
-Boards with the ST SPEAr600 SoC shall have the following properties:
-Required root node property:
-compatible = "st,spear600";
-
-Boards with the ST SPEAr300 SoC shall have the following properties:
-Required root node property:
-compatible = "st,spear300";
-
-Boards with the ST SPEAr310 SoC shall have the following properties:
-Required root node property:
-compatible = "st,spear310";
-
-Boards with the ST SPEAr320 SoC shall have the following properties:
-Required root node property:
-compatible = "st,spear320";
-
-Boards with the ST SPEAr1310 SoC shall have the following properties:
-Required root node property:
-compatible = "st,spear1310";
-
-Boards with the ST SPEAr1340 SoC shall have the following properties:
-Required root node property:
-compatible = "st,spear1340";

Documentation/devicetree/bindings/arm/spear.yaml

+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/arm/spear.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ST SPEAr Platforms Device Tree Bindings
+
+maintainers:
+  - Viresh Kumar <vireshk@kernel.org>
+  - Stefan Roese <sr@denx.de>
+
+properties:
+  $nodename:
+    const: '/'
+  compatible:
+    items:
+      - enum:
+          - st,spear600
+          - st,spear300
+          - st,spear310
+          - st,spear320
+          - st,spear1310
+          - st,spear1340
+...