Add following APIs in the list of managed resources of IIO:
devm_iio_channel_get()
devm_iio_channel_get_all()
devm_iio_channel_release()
devm_iio_channel_release_all()
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>