dt-bindings: input: touchscreen: goodix: Add "panel" property

Add a "panel" property to define a relationship between a touchscreen
and an associated panel when more than one of each exist in a device.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
[picked with the rest with Dmitry's Ack]
Link: https://patch.msgid.link/20260113195721.151205-6-macroalpha82@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

Author: macromorgan

Documentation/devicetree/bindings/input/touchscreen/goodix.yaml

@@ -42,6 +42,8 @@ properties:
       address, thus it can be driven by the host during the reset sequence.
     maxItems: 1
 
+  panel: true
+
   reset-gpios:
     maxItems: 1