assume PeiServices Pointer Table can be located in a standard way defined in PI spec. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5955 6f19259b-4bc3-4df7-8a09-765794883524
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5821 6f19259b-4bc3-4df7-8a09-765794883524
2) Update some doxygen comments. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5309 6f19259b-4bc3-4df7-8a09-765794883524