dt-bindings: input/touchscreen: bindings for Imagis

This patch adds device-tree bindings for the Imagis
IST3038C touch screen IC.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Markuss Broks <markuss.broks@gmail.com>
Link: https://lore.kernel.org/r/20220305165330.13061-2-markuss.broks@gmail.com


Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>