dt-bindings: MIPS: Add X2000E based CU2000-Neo.

Add bindings for Ingenic X2000E based board, prepare for later dts.
Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

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

@@ -47,4 +47,9 @@ properties:
         items:
           - const: yna,cu1830-neo
           - const: ingenic,x1830
+
+      - description: YSH & ATIL General Board, CU2000 Module with Neo Backplane
+        items:
+          - const: yna,cu2000-neo
+          - const: ingenic,x2000e
 ...