dt-bindings: input: Add bindings for Azoteq IQS269A

This patch adds device tree bindings for the Azoteq IQS269A
capacitive touch controller.

Signed-off-by: Jeff LaBundy <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Dmitry Torokhov <[email protected]>

Author: jlabundy