MdeModulePkg/BDS doesn't launch UI (Boot Manager Menu) from platform
side.
The change removes the code which launches the UI but still set the
boot timeout.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>