Call ft_board_setup() from the bootm command.

In the patch titled "Create new fdt boardsetup command..." I removed the
call to ft_board_setup() from the routine fdt_chosen(), but I forgot
to add a direct call back into cmd_bootm.c

This fixes the oversight by adding the direct call to the bootm command.

Signed-off-by: Gerald Van Baren <vanbaren@cideas.com>