Blackfin: bf537-stamp: use correct spi mode with ad2s90 parts

Signed-off-by: NBarry Song <barry.song@analog.com>
Signed-off-by: NMike Frysinger <vapier@gentoo.org>

arch/blackfin/mach-bf537/boards/stamp.c

@@ -1035,6 +1035,7 @@ static struct spi_board_info bfin_spi_board_info[] __initdata = {
 		.modalias = "ad2s90",
 		.bus_num = 0,
 		.chip_select = 3,            /* change it for your board */
+		.mode = SPI_MODE_3,
 		.platform_data = NULL,
 		.controller_data = &ad2s90_spi_chip_info,
 	},