PI spec defines EfiGcdMemoryTypePersistent name, MdePkg uses EfiGcdMemoryTypePersistentMemory name. So, EfiGcdMemoryTypePersistent is added. And, EfiGcdMemoryTypePersistentMemory is kept for compatility. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Liming Gao <liming.gao@intel.com> Reviewed-by: Star Zeng <star.zeng@intel.com>