dt-bindings: input: goodix,gt9916: Document gt9897 compatible

Document the Goodix GT9897 which is a Berlin-A series touchscreen
controller IC by Goodix.

Acked-by: Rob Herring (Arm) <[email protected]>
Signed-off-by: Jens Reidel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Dmitry Torokhov <[email protected]>

Author: Gelbpunkt

Documentation/devicetree/bindings/input/touchscreen/goodix,gt9916.yaml

@@ -19,6 +19,7 @@ allOf:
 properties:
   compatible:
     enum:
+      - goodix,gt9897
       - goodix,gt9916
 
   reg: