staging:iio:accel:lis3l02dq ring->buffer renames.

This driver already supports kfifo usage, so the term ring is
misleading and hence replaced.

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --cc drivers/staging/iio/accel/lis3l02dq.h
Simple merge

diff --cc drivers/staging/iio/accel/lis3l02dq_core.c
Simple merge

diff --cc drivers/staging/iio/accel/lis3l02dq_ring.c
Simple merge