ARM: ep93xx: add DMA engine to the defconfig

Several boards can make use of the DMA engine on the EP93xx
so let's enable this by default in the defconfig.
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/configs/ep93xx_defconfig

@@ -109,6 +109,8 @@ CONFIG_RTC_CLASS=y
 CONFIG_RTC_DRV_DS1307=y
 CONFIG_RTC_DRV_M48T86=y
 CONFIG_RTC_DRV_EP93XX=y
+CONFIG_DMADEVICES=y
+CONFIG_EP93XX_DMA=y
 CONFIG_EXT2_FS=y
 CONFIG_EXT3_FS=y
 # CONFIG_EXT3_FS_XATTR is not set