dt-bindings: input: touchscreen: himax,hx83112b: add HX83100A

Add a compatible string for the Himax HX83100A touch controller.

The HX83100A presents touch events on the internal bus rather than
offering a dedicated event register like the other chips in this family
do.
Signed-off-by: Felix Kaechele <felix@kaechele.ca>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240620145019.156187-2-felix@kaechele.caSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Documentation/devicetree/bindings/input/touchscreen/himax,hx83112b.yaml

@@ -15,6 +15,7 @@ allOf:
 properties:
   compatible:
     enum:
+      - himax,hx83100a
       - himax,hx83112b
 
   reg: