Input: add SparkFun Qwiic Joystick driver

A simple analog joystick built on Low Power ATtiny85 Microcontroller.
Directional movements are measured with two 10 kΩ potentiometers
connected with a gimbal mechanism that separates the horizontal and
vertical movements. This joystick also has a select button that is actuated
when the joystick is pressed down.

Input events polled over the I2C bus.

Product page:
https://www.sparkfun.com/products/15168
Firmware and hardware sources:
https://github.com/sparkfun/Qwiic_Joystick



Tested on RPi4B and O4-iMX-NANO boards.

Signed-off-by: Oleh Kravchenko <oleg@kaa.org.ua>
Reviewed-by: Jeff LaBundy <jeff@labundy.com>
Link: https://lore.kernel.org/r/20210608223130.16830-2-oleg@kaa.org.ua


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