WIP: This still needs improvement: HID: nintendo: add IMU support

This patch adds support for the controller's IMU. The accelerometer and
gyro data are both provided to userspace using a second input device.
The devices can be associated using their uniq value (set to the
controller's MAC address).

The majority of this patch's functinoality was provided by Carl Mueller.

Signed-off-by: Daniel J. Ogorchock <djogorchock@gmail.com>

Author: DanielOgorchock