SecurityPkg-Opal(1): Use fixed SMM communication buffer in OPAL password lib.

SecurityPkg-Opal(1): Use fixed SMM communication buffer in OPAL password lib.

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>