Change NT32 and DUET to use UEFI Shell by default. Use "-D USE_OLD_SHELL" for NT32 to use EDK Shell.
    
    Contributed-under: TianoCore Contribution Agreement 1.0
    Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
    Reviewed-by: Eric Dong <eric.dong@intel.com>
    
    git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16444 6f19259b-4bc3-4df7-8a09-765794883524