MX28: m28evk: Enable SPI DMA

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Otavio Salvador <otavio@ossystems.com.br>
Cc: Stefano Babic <sbabic@denx.de>

include/configs/m28evk.h

@@ -243,6 +243,7 @@
 #ifdef	CONFIG_CMD_SPI
 #define	CONFIG_HARD_SPI
 #define	CONFIG_MXS_SPI
+#define	CONFIG_MXS_SPI_DMA_ENABLE
 #define	CONFIG_SPI_HALF_DUPLEX
 #define	CONFIG_DEFAULT_SPI_BUS		2
 #define	CONFIG_DEFAULT_SPI_MODE		SPI_MODE_0