dt-bindings: input/touchscreen: Add compatible for IST3038B

Imagis IST3038B is a variant (firmware?) of Imagis IST3038 IC
differing from IST3038C in its register interface. Add the
compatible for it to the IST3038C bindings.

Signed-off-by: Markuss Broks <[email protected]>
Acked-by: Conor Dooley <[email protected]>
[[email protected]: elaborate chip differences in the commit message]
Signed-off-by: Karel Balej <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Dmitry Torokhov <[email protected]>

Author: nergzd723

Documentation/devicetree/bindings/input/touchscreen/imagis,ist3038c.yaml

@@ -18,6 +18,7 @@ properties:
 
   compatible:
     enum:
+      - imagis,ist3038b
       - imagis,ist3038c
 
   reg: