This patch enhance OPAL password lib SMM communication by using fixed SMM communication buffer. Update OPAL password lib to consume EDKII_PI_SMM_COMMUNICATION_REGION_TABLE as fixed communication buffer for SMM communication. This is designed to meet Microsoft WSMT table definition on FIXED_COMM_BUFFERS requirement. Cc: Eric Dong <eric.dong@intel.com> Cc: Feng Tian <feng.tian@intel.com> Cc: Laszlo Ersek <lersek@redhat.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Eric Dong <eric.dong@intel.com> Reviewed-by: Feng Tian <feng.tian@intel.com>