MX28: mx28evk: Enable SPI DMA

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
diff --git a/include/configs/mx28evk.h b/include/configs/mx28evk.h
index 4e1e6bc..e34fd96 100644
--- a/include/configs/mx28evk.h
+++ b/include/configs/mx28evk.h
@@ -199,6 +199,7 @@
 #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