IntelFrameworkModule/LegacyBios: Use reserved memory for legacy data
    
    Certain Legacy USB implementation needs to access legacy data (BDA,
    etc.) from SMM environment. While currently it's not allowed to
    access BS memory from SMM after EndofDxe, change the legacy data
    to use reserved memory type.
    
    Contributed-under: TianoCore Contribution Agreement 1.1
    Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
    Reviewed-by: Star Zeng <star.zeng@intel.com>