iio: adc: max1241: Fix alignment for DMA safety

iio: adc: max1241: Fix alignment for DMA safety

[ Upstream commit 9d7019e43ee67a48cef63f8f23f002233064d390 ]

____cacheline_aligned is an insufficient guarantee for non-coherent DMA
on platforms with 128 byte cachelines above L1.  Switch to the updated
IIO_DMA_MINALIGN definition.

Fixes: 8a80a71d9020 ("iio: adc: Add MAX1241 driver")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Alexandru Lazar <alazar@startmail.com>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20220508175712.647246-27-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>