configs: ls1028a: enable CMD_DM

Since at least some of the drivers relevant to LS1028A are now following
DM, it's useful to have dm command enabled by default.

Signed-off-by: Alex Marginean <alexandru.marginean@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
4 files changed