Moving usage of 'WatchDogTimer' to 'WatchdogTimer' to match the architectural protocol, as well as the more common usage of 'watchdog timer' vs. 'watch dog timer'. Consistency is needed for building on systems with case-sensitive filesystems. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@4710 6f19259b-4bc3-4df7-8a09-765794883524