board: ti: am57xx: Enable CMD_DDR3

Enable CMD_DDR3 on all am57xx based platforms.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
diff --git a/arch/arm/mach-omap2/omap5/Kconfig b/arch/arm/mach-omap2/omap5/Kconfig
index 8c1730a..deb9873 100644
--- a/arch/arm/mach-omap2/omap5/Kconfig
+++ b/arch/arm/mach-omap2/omap5/Kconfig
@@ -39,6 +39,7 @@
 	select BOARD_LATE_INIT
 	select DRA7XX
 	select TI_I2C_BOARD_DETECT
+	select CMD_DDR3
 	imply SCSI
 	imply SPL_THERMAL
 	imply DM_THERMAL