Correct the alignment calculation of PE/COFF attribute certificate entry.

This is to resolve the possible certificate entry retrieving issue caused by un-aligned (8-bytes) VirtualAddress in some PE/COFF image, which may break secure boot.

Contributed-under: TianoCore Contribution Agreement 1.0

Signed-off-by: Qin Long <qin.long@intel.com> 
Reviewed-by: Siyuan Fu <siyuan.fu@intel.com>
Reviewed-by: Guo Dong <guo.dong@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16449 6f19259b-4bc3-4df7-8a09-765794883524