dt-bindings: memory: convert H8/300 bus controller to dtschema

Convert H8/300 bus controller bindings to DT schema format using
json-schema.

The conversion also extends the bindings to match what is really used in
existing devicetree sources (the original file mentions only
"renesas,h8300-bsc" but "renesas,h8300h-bsc" and "renesas,h8s-bsc" are
used with it).
Signed-off-by: NKrzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20210818202953.16862-1-krzysztof.kozlowski@canonical.comSigned-off-by: NRob Herring <robh@kernel.org>

Documentation/devicetree/bindings/memory-controllers/renesas,h8300-bsc.txt

-* H8/300 bus controller
-
-Required properties:
-  - compatible: Must be "renesas,h8300-bsc".
-  - reg: Base address and length of BSC registers.
-
-Example.
-	bsc: memory-controller@fee01e {
-		compatible = "renesas,h8300h-bsc", "renesas,h8300-bsc";
-		reg = <0xfee01e 8>;
-	};
-

Documentation/devicetree/bindings/memory-controllers/renesas,h8300-bsc.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/memory-controllers/renesas,h8300-bsc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: H8/300 bus controller
+
+maintainers:
+  - Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
+  - Yoshinori Sato <ysato@users.sourceforge.jp>
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - renesas,h8300h-bsc
+          - renesas,h8s-bsc
+      - const: renesas,h8300-bsc
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    memory-controller@fee01e {
+        compatible = "renesas,h8300h-bsc", "renesas,h8300-bsc";
+        reg = <0xfee01e 8>;
+    };