dt-bindings: input: maxtouch: add common touchscreen properties

Since atmel,maxtouch describes touchscreens too, it should include common
touchscreen properties.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20250909054903.11519-2-clamor95@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Author: clamor-s

Documentation/devicetree/bindings/input/atmel,maxtouch.yaml

@@ -16,6 +16,7 @@ description: |
 
 allOf:
   - $ref: input.yaml#
+  - $ref: touchscreen/touchscreen.yaml#
 
 properties:
   compatible:
@@ -95,7 +96,7 @@ required:
   - reg
   - interrupts
 
-additionalProperties: false
+unevaluatedProperties: false
 
 examples:
   - |