Add GetTimeInNanoSecond, already declared in the TimerLib API, to EmulatorPkg implementations of TimerLib. Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Andrew Fish <afish@apple.com> Cc: Ray Ni <ray.ni@intel.com> Signed-off-by: Michael Johnson <michael.johnson@intel.com> Reviewed-by: Jordan Justen <jordan.l.justen@intel.com> Reviewed-by: Ray Ni <ray.ni@intel.com>