iio: dac: ad5766: remove bits_per_word = 8

Remove setting bits_per_word = 8 from the ad5766 driver. This is the
default value for SPI transfers, so it is not necessary to explicitly
set it.

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

drivers/iio/dac/ad5766.c

···
 	struct spi_transfer xfers[] = {
 		{
 			.tx_buf = &st->data[0].d32,
-			.bits_per_word = 8,
 			.len = 3,
 			.cs_change = 1,
 		}, {
 			.tx_buf = &st->data[1].d32,
 			.rx_buf = &st->data[2].d32,
-			.bits_per_word = 8,
 			.len = 3,
 		},
 	};