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>