at91: gurnard: Enable DM_SPI

Enable DM_SPI for atmel SPI driver on gurnard board.

Cc: Simon Glass <sjg@chromium.org>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig
index 6907263..d73adf3 100644
--- a/arch/arm/mach-at91/Kconfig
+++ b/arch/arm/mach-at91/Kconfig
@@ -85,6 +85,7 @@
 	select BOARD_LATE_INIT
 	select DM
 	select DM_SERIAL
+	select DM_SPI
 	select DM_GPIO
 	select DM_ETH