MdeModulePkg: Retrieve boot manager menu from any fv
    
    REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3384
    
    Currently, UefiBootManagerLib has the below assumption:
      Assume the BootManagerMenuFile is in the same FV as the module links to this library.
    It has some limitation now, so remove the assumption.
    
    Cc: Jian J Wang <jian.j.wang@intel.com>
    Cc: Hao A Wu <hao.a.wu@intel.com>
    Cc: Zhichao Gao <zhichao.gao@intel.com>
    Cc: Ray Ni <ray.ni@intel.com>
    Reviewed-by: Hao A Wu <hao.a.wu@intel.com>
    Reviewed-by: Ray Ni <ray.ni@intel.com>
    Signed-off-by: Zhiguang Liu <zhiguang.liu@intel.com>