To follow Shell spec 2.2, change "dh" to support dump from protocol GUID and support "decode" parameter to dump the GUID/name mapping. Contributed-under: TianoCore Contribution Agreement 1.0 Cc: Jaben Carsey <jaben.carsey@intel.com> Cc: Ruiyu Ni <ruiyu.ni@intel.com> Signed-off-by: Chen A Chen <chen.a.chen@intel.com> Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com> Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>