dockstar: Perform base CONFIG_DM enablement

As these boards support CONFIG_OF_CONTROL today, perform a basic
CONFIG_DM migration.

Cc: Eric Cooper <ecc@cmu.edu>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/dockstar_defconfig b/configs/dockstar_defconfig
index 4eba866..8d43609 100644
--- a/configs/dockstar_defconfig
+++ b/configs/dockstar_defconfig
@@ -9,6 +9,7 @@
 CONFIG_ENV_OFFSET=0x80000
 CONFIG_DEFAULT_DEVICE_TREE="kirkwood-dockstar"
 CONFIG_IDENT_STRING="\nSeagate FreeAgent DockStar"
+# CONFIG_SYS_MALLOC_F is not set
 CONFIG_BOOTDELAY=3
 CONFIG_USE_PREBOOT=y
 # CONFIG_DISPLAY_BOARDINFO is not set
@@ -31,6 +32,7 @@
 CONFIG_ENV_OVERWRITE=y
 CONFIG_ENV_IS_IN_NAND=y
 CONFIG_NETCONSOLE=y
+CONFIG_DM=y
 # CONFIG_MMC is not set
 CONFIG_MTD=y
 CONFIG_MTD_RAW_NAND=y