dt-bindings: input: touchscreen: edt-ft5x06: use unevaluatedProperties

In Xiaomi Poco F1 (qcom/sdm845-xiaomi-beryllium-ebbg.dts), the FocalTech
FT8719 touchscreen is integrally connected to the display panel
(EBBG FT8719) and thus should be power sequenced together with display
panel using the panel property. Since the edt-ft5x06 touchscreen binding
uses almost all the properties present in touchscreen.yaml, let's remove
additionalProperties: false and use unevaluatedProperties to include all
the properties, including the needed panel property.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Joel Selvaraj <foss@joelselvaraj.com>
Link: https://lore.kernel.org/r/20250506-pocof1-touchscreen-support-v4-1-bfb53da52945@joelselvaraj.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.yaml

@@ -103,16 +103,9 @@ properties:
     minimum: 0
     maximum: 255
 
-  touchscreen-size-x: true
-  touchscreen-size-y: true
-  touchscreen-fuzz-x: true
-  touchscreen-fuzz-y: true
-  touchscreen-inverted-x: true
-  touchscreen-inverted-y: true
-  touchscreen-swapped-x-y: true
   interrupt-controller: true
 
-additionalProperties: false
+unevaluatedProperties: false
 
 required:
   - compatible