Input: Add support for Azoteq IQS626A

This patch adds support for the Azoteq IQS626A capacitive touch
controller.

Signed-off-by: Jeff LaBundy <jeff@labundy.com>
Link: https://lore.kernel.org/r/20210301234928.4298-5-jeff@labundy.com


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