dt-bindings: input: Add bindings for Azoteq IQS7210A/7211A/E

Add bindings for the Azoteq IQS7210A/7211A/E family of trackpad/
touchscreen controllers.

Signed-off-by: Jeff LaBundy <jeff@labundy.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/ZHVEa0yM1LLUJEfO@nixie71


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