imx: convert dms-ba16 boards to DM_VIDEO

Migration to DM_VIDEO driver is long overdue. Update defconfigs
to enable usage of converted ipuv3 driver DM configuration.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Cc: Akshay Bhat <akshaybhat@timesys.com>
Cc: Ken Lin <Ken.Lin@advantech.com.tw>