REF: https://bugzilla.tianocore.org/show_bug.cgi?id=653 Correct description of Timeout param in XhciReg.h to be matched with XhciReg.c. Cc: Alexei Fedorov <Alexei.Fedorov@arm.com> Cc: Ruiyu Ni <ruiyu.ni@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Star Zeng <star.zeng@intel.com> Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>