MdeModulePkg:System hangs in setup menu

System hangs when RTC time rollover 1999 to 2000
Error processing of GetTime function:
If get time fail,the date/time will display ??,
and update help info to let user know get time fail.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17651 6f19259b-4bc3-4df7-8a09-765794883524