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

Convert ST STi SoC bindings to DT schema format using json-schema.
Acked-by: Patrice Chotard <patrice.chotard@st.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: devicetree@vger.kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/arm/sti.txt

-ST STi Platforms Device Tree Bindings
----------------------------------------
-
-Boards with the ST STiH415 SoC shall have the following properties:
-Required root node property:
-compatible = "st,stih415";
-
-Boards with the ST STiH416 SoC shall have the following properties:
-Required root node property:
-compatible = "st,stih416";
-
-Boards with the ST STiH407 SoC shall have the following properties:
-Required root node property:
-compatible = "st,stih407";
-
-Boards with the ST STiH410 SoC shall have the following properties:
-Required root node property:
-compatible = "st,stih410";
-
-Boards with the ST STiH418 SoC shall have the following properties:
-Required root node property:
-compatible = "st,stih418";
-

Documentation/devicetree/bindings/arm/sti.yaml

+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/arm/sti.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ST STi Platforms Device Tree Bindings
+
+maintainers:
+  - Patrice Chotard <patrice.chotard@st.com>
+
+properties:
+  $nodename:
+    const: '/'
+  compatible:
+    items:
+      - enum:
+          - st,stih415
+          - st,stih416
+          - st,stih407
+          - st,stih410
+          - st,stih418
+...