staging:iio:adis16260: Drop unused 'negate' property

Remove the unused 'negate' property from the driver state struct. This also
means we can now use the adis struct directly as the driver data.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
3 files changed