arm: mvebu: controlcenterdc: Update config

Several drivers used by the ControlCenterDC board were converted to DM
upstream. But the board had not been using these drivers yet.

Update the board's config file to reflect these changes and use the DM
version of these drivers. No further device tree updates are necessary,
since the devices in question are already present in the device tree.

This especially fixes the three compile warnings about CONFIG_DM_MMC,
CONFIG_DM_USB, and CONFIG_AHCI for the ControlCenterDC board.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
Signed-off-by: Stefan Roese <sr@denx.de>