m68k: Remove M54451EVB board

This board has not been converted to CONFIG_DM_MMC by the deadline.
Remove it.  As this is also the last in family remove the related
support as well.

Cc: Angelo Durgehello <angelo.dureghello@timesys.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
23 files changed