iio: temp: ltc2983: Fix alignment for DMA safety

____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: f110f3188e56 ("iio: temperature: Add support for LTC2983")
Signed-off-by: Jonathan Cameron <[e-mail]>
Acked-by: Nuno Sá <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/iio/temperature/ltc2983.c

···
 	u8 num_channels;
 	u8 iio_channels;
 	/*
-	 * DMA (thus cache coherency maintenance) requires the
+	 * DMA (thus cache coherency maintenance) may require the
 	 * transfer buffers to live in their own cache lines.
 	 * Holds the converted temperature
 	 */
-	__be32 temp ____cacheline_aligned;
+	__be32 temp __aligned(IIO_DMA_MINALIGN);
 };
 
 struct ltc2983_sensor {