iio: proximity: vcnl3020: Drop unnecessary alignment requirement for i2c device

I2C does not by default use buffers directly for DMA so there is
no need to ensure they are DMA safe.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Ivan Mikhaylov <i.mikhaylov@yadro.com>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20220508175712.647246-88-jic23@kernel.org

drivers/iio/proximity/vcnl3020.c

@@ -71,14 +71,14 @@ static const int vcnl3020_prox_sampling_frequency[][2] = {
  * @dev:	vcnl3020 device.
  * @rev:	revision id.
  * @lock:	lock for protecting access to device hardware registers.
- * @buf:	DMA safe __be16 buffer.
+ * @buf:	__be16 buffer.
  */
 struct vcnl3020_data {
 	struct regmap *regmap;
 	struct device *dev;
 	u8 rev;
 	struct mutex lock;
-	__be16 buf ____cacheline_aligned;
+	__be16 buf;
 };
 
 /**