MdePkg: Correct EfiGcdMemoryTypePersistent name to follow PI spec
MdePkg: Correct EfiGcdMemoryTypePersistent name to follow PI spec

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 <6480311aeeb4b006862f6d13ebabddc03f51e507@intel.com>
Reviewed-by: Star Zeng <5c6bb72efe464613af94e84c05522a361b23844a@intel.com>

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