dt-bindings: memory: convert Marvell MVEBU SDRAM controller to dtschema

Convert Marvell MVEBU SDRAM controller bindings to DT schema format
using json-schema.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20210817093807.59531-1-krzysztof.kozlowski@canonical.comSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/memory-controllers/marvell,mvebu-sdram-controller.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/memory-controllers/marvell,mvebu-sdram-controller.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Marvell MVEBU SDRAM controller
+
+maintainers:
+  - Jan Luebbe <jlu@pengutronix.de>
+  - Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
+
+properties:
+  compatible:
+    const: marvell,armada-xp-sdram-controller
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    memory-controller@1400 {
+        compatible = "marvell,armada-xp-sdram-controller";
+        reg = <0x1400 0x500>;
+    };

Documentation/devicetree/bindings/memory-controllers/mvebu-sdram-controller.txt

-Device Tree bindings for MVEBU SDRAM controllers
-
-The Marvell EBU SoCs all have a SDRAM controller. The SDRAM controller
-differs from one SoC variant to another, but they also share a number
-of commonalities.
-
-For now, this Device Tree binding documentation only documents the
-Armada XP SDRAM controller.
-
-Required properties:
-
- - compatible: for Armada XP, "marvell,armada-xp-sdram-controller"
- - reg: a resource specifier for the register space, which should
-   include all SDRAM controller registers as per the datasheet.
-
-Example:
-
-sdramc@1400 {
-	compatible = "marvell,armada-xp-sdram-controller";
-	reg = <0x1400 0x500>;
-};