staging:iio:accel:adis16201 general cleanup, move to iio_priv and buffers in adis1620...

Basically use various new facilities to tidy up.

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>

diff --cc drivers/staging/iio/accel/adis16201.h
Simple merge

diff --cc drivers/staging/iio/accel/adis16201_core.c
Simple merge

diff --cc drivers/staging/iio/accel/adis16201_ring.c
Simple merge

diff --cc drivers/staging/iio/accel/adis16201_trigger.c
Simple merge