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: NLaxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>