MdePkg: Add two PcdApi for Patch VOID* PCD set operation.

MdePkg: Add two PcdApi for Patch VOID* PCD set operation.

Two new APIs LibPatchPcdSetPtrAndSize() and LibPatchPcdSetPtrAndSizeS()
are added to catch the size of the updated VOID* PCD value buffer, then
PcdGetSize() API can return the actual size.

Update three PcdLib instances to implement these two APIs.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18269 6f19259b-4bc3-4df7-8a09-765794883524