HID: nintendo: add support for reading user calibration

If the controller's SPI flash contains user stick calibration(s), they
should be prioritized over the factory calibrations. The user
calibrations have 2 magic bytes preceding them. If the bytes are the
correct magic values, the user calibration is used.

Signed-off-by: Daniel J. Ogorchock <djogorchock@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>