staging:iio:imu:adis16344 support

Simple device. Note the sparse scan mask used.

Done from datasheet as very similar to existing parts.

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Acked-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>