MdePkg: Add UDF volume structure definitions
    
    This patch adds basic volume structure definitions necessary to identify
    a valid UDF file system on a block device, as specified by OSTA
    Universal Disk Format Specification 2.60.
    
    Cc: Michael D Kinney <michael.d.kinney@intel.com>
    Cc: Liming Gao <liming.gao@intel.com>
    Cc: Laszlo Ersek <lersek@redhat.com>
    Contributed-under: TianoCore Contribution Agreement 1.1
    Signed-off-by: Paulo Alcantara <pcacjr@zytor.com>
    Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>