dt-bindings: display: mitsubishi,aa104xd12: Adjust allowed and required properties

The Mitsubishi aa104xd12 panel requires an external backlight driver
circuit, so allow the "backlight" property.

There are users of this panel without a vcc-supply, so it shouldn't be
required.

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

@@ -43,14 +43,14 @@ properties:
   height-mm:
     const: 158
 
+  backlight: true
   panel-timing: true
   port: true
 
 additionalProperties: false
 
 required:
   - compatible
-  - vcc-supply
   - data-mapping
   - width-mm
   - height-mm