dt-bindings: input: touchscreen: edt-ft5x06: Document FT8201 support

Document FocalTech FT8201 support by adding the compatible.
Signed-off-by: Felix Kaechele <felix@kaechele.ca>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240804031310.331871-2-felix@kaechele.caSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

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

@@ -42,6 +42,7 @@ properties:
       - focaltech,ft5426
       - focaltech,ft5452
       - focaltech,ft6236
+      - focaltech,ft8201
       - focaltech,ft8719
 
   reg: