staging:iio:tree wide. abi fixup for in_ out_ prefix introduction.

staging:iio:tree wide. abi fixup for in_ out_ prefix introduction.

This patch set should bring all the attributes created outside
of chan_spec registration inline with the new abi.

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>