iio: adc: ad4695: use IIO_DECLARE_DMA_BUFFER_WITH_TS

Use IIO_DECLARE_DMA_BUFFER_WITH_TS() to declare the buffer that gets
used with iio_push_to_buffers_with_ts(). This makes the code a bit
easier to read and understand.

Reviewed-by: Trevor Gamblin <[e-mail]>
Reviewed-by: Nuno Sá <[e-mail]>
Signed-off-by: David Lechner <[e-mail]>
Link: https://patch.msgid.link/202[e-mail]
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/adc/ad4695.c

···
 	struct spi_transfer buf_read_xfer[AD4695_MAX_CHANNELS * 2 + 3];
 	struct spi_message buf_read_msg;
 	/* Raw conversion data received. */
-	u16 buf[ALIGN((AD4695_MAX_CHANNELS + 1) * sizeof(u16),
-		      sizeof(s64)) + sizeof(s64)] __aligned(IIO_DMA_MINALIGN);
+	IIO_DECLARE_DMA_BUFFER_WITH_TS(u16, buf, AD4695_MAX_CHANNELS + 1);
 	u16 raw_data;
 	/* Commands to send for single conversion. */
 	u16 cnv_cmd;