dt-bindings: input: focaltech,ft8112: Add focaltech,ft3d81 compatible

The Focaltech ft3d81 is fully compatible with the ft8112 i.e.
it uses the same I2C-HID protocol and the same power-on/reset sequencing,
DT nodes for boards carrying an ft3d81,can therefore bind to the existing
ft8112 driver without any additional changes.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Pradyot Kumar Nayak <pradyot.nayak@oss.qualcomm.com>
Link: https://patch.msgid.link/20260717-add_focaltech_ft3d81_touchscreen_support-v4-1-5dd091e25801@oss.qualcomm.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Documentation/devicetree/bindings/input/focaltech,ft8112.yaml

@@ -18,8 +18,13 @@ allOf:
 
 properties:
   compatible:
-    enum:
-      - focaltech,ft8112
+    oneOf:
+      - items:
+          - enum:
+              - focaltech,ft3d81
+          - const: focaltech,ft8112
+      - enum:
+          - focaltech,ft8112
 
   reg:
     maxItems: 1