MdePkg GlobalVariable.h: Add comments for L"SysPrep####".

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17576 6f19259b-4bc3-4df7-8a09-765794883524