MdeModulePkg/BMMUI: Update TerminalMenu and ConsoleMenu in callback

MdeModulePkg/BMMUI: Update TerminalMenu and ConsoleMenu in callback

In current codes, When user does some change related to Console or Terminal,
when saving data, it will update the content in TerminalMenu and ConsoleMenu
in BootMaintRouteConfig function. This patch moves the update action to the
BootMaintCallback function with EFI_BROWSER_ACTION_CHANGED type.
The reason for this change is: in BootMaintRouteConfig function when
Var_UpdateConsoleXXXOption() return failure and user discard the previous
change, we should re_update the content in the TerminalMenu and ConsoleMenu.
So we move the update action to the changed callback.

Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>