dt-bindings: MIPS: Add Ingenic XBurst based boards.

Add Ingenic XBurst based boards, prepare for later dts.
Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Paul Burton <paulburton@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: devicetree@vger.kernel.org
Cc: robh+dt@kernel.org
Cc: paul.burton@mips.com
Cc: jhogan@kernel.org
Cc: mripard@kernel.org
Cc: shawnguo@kernel.org
Cc: mark.rutland@arm.com
Cc: alexandre.belloni@bootlin.com
Cc: ralf@linux-mips.org
Cc: heiko@sntech.de
Cc: icenowy@aosc.io
Cc: ak@linux.intel.com
Cc: laurent.pinchart@ideasonboard.com
Cc: krzk@kernel.org
Cc: geert+renesas@glider.be
Cc: paul@crapouillou.net
Cc: prasannatsmkumar@gmail.com
Cc: keescook@chromium.org
Cc: ebiederm@xmission.com
Cc: sernia.zhou@foxmail.com
Cc: zhenwenjin@gmail.com
Cc: 772753199@qq.com

Documentation/devicetree/bindings/mips/ingenic/devices.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mips/ingenic/devices.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Ingenic XBurst based Platforms Device Tree Bindings
+
+maintainers:
+  - 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
+description: |
+  Devices with a Ingenic XBurst CPU shall have the following properties.
+
+properties:
+  $nodename:
+    const: '/'
+  compatible:
+    oneOf:
+
+      - description: Qi Hardware Ben NanoNote
+        items:
+          - const: qi,lb60
+
+      - description: Game Consoles Worldwide GCW Zero
+        items:
+          - const: gcw,zero
+
+      - description: MIPS Creator CI20
+        items:
+          - const: img,ci20
+
+      - description: YSH & ATIL General Board CU Neo
+        items:
+          - const: yna,cu1000-neo
+...