dt-bindings: arm: renesas: Convert 'renesas,prr' to json-schema

Convert Renesas Product Register bindings documentation to json-schema.
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20190908120528.9392-1-horms+renesas@verge.net.auSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

Documentation/devicetree/bindings/arm/renesas,prr.txt

-Renesas Product Register
-
-Most Renesas ARM SoCs have a Product Register or Boundary Scan ID Register that
-allows to retrieve SoC product and revision information.  If present, a device
-node for this register should be added.
-
-Required properties:
-  - compatible: Must be one of:
-    "renesas,prr"
-    "renesas,bsid"
-  - reg: Base address and length of the register block.
-
-
-Examples
---------
-
-	prr: chipid@ff000044 {
-		compatible = "renesas,prr";
-		reg = <0 0xff000044 0 4>;
-	};

Documentation/devicetree/bindings/arm/renesas,prr.yaml

+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/arm/renesas,prr.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Renesas Product Register
+
+maintainers:
+  - Geert Uytterhoeven <geert+renesas@glider.be>
+  - Magnus Damm <magnus.damm@gmail.com>
+
+description: |
+  Most Renesas ARM SoCs have a Product Register or Boundary Scan ID
+  Register that allows to retrieve SoC product and revision information.
+  If present, a device node for this register should be added.
+
+properties:
+  compatible:
+    enum:
+      - renesas,prr
+      - renesas,bsid
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+examples:
+  - |
+    prr: chipid@ff000044 {
+        compatible = "renesas,prr";
+        reg = <0 0xff000044 0 4>;
+    };