iio: mxs-lradc: Fix the order of resources removal

Fix the order of resources removal in the error path of mxs_lradc_probe()
and also in mxs_lradc_remove().

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Marek Vasut <marex@denx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>