Change "dmpstore" to show name of known variable vendor GUID. The name is got from ShellProtocol.GetGuidName(). Cc: Jaben Carsey <jaben.carsey@intel.com> Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Huajing Li <huajing.li@intel.com> Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>