dt-bindings: display: mitsubishi,aa104xd12: Allow jeida-18 for data-mapping

There's both a user and the datasheet[1] indicate that 6-bpp is supported
as well.

[1] https://agdisplays.com/pub/media/catalog/datasheet/Mitsubishi/AA104XD12.pdf

Signed-off-by: "Rob Herring (Arm)" <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Rob Herring (Arm) <[email protected]>

Author: robherring

Documentation/devicetree/bindings/display/panel/mitsubishi,aa104xd12.yaml

@@ -33,7 +33,9 @@ properties:
     description: Reference to the regulator powering the panel VCC pins.
 
   data-mapping:
-    const: jeida-24
+    enum:
+      - jeida-18
+      - jeida-24
 
   width-mm:
     const: 210