am335x: igep003x: Enable DM_SPI

Enable DM_SPI for am355x igep003x board.

Build is fine, but not tested.

Cc: Javier Martínez Canillas <javier@dowhile0.org>
Signed-off-by: NJagan Teki <jagan@amarulasolutions.com>

configs/am335x_igep003x_defconfig

@@ -72,6 +72,7 @@ CONFIG_PHY_SMSC=y
 CONFIG_MII=y
 CONFIG_DRIVER_TI_CPSW=y
 CONFIG_SPI=y
+CONFIG_DM_SPI=y
 CONFIG_OMAP3_SPI=y
 CONFIG_FAT_WRITE=y
 CONFIG_FDT_FIXUP_PARTITIONS=y