Implement the clock() function using the EFI time-of-day clock instead of a TimerLib instance.
Signed-off-by: darylm503
Reviewed-by: jljusten
Reviewed-by: geekboy15a
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12683 6f19259b-4bc3-4df7-8a09-765794883524