MdeModulePkg: Add new driver to publish EDKII_PI_SMM_COMMUNICATION_REGION_TABLE.

MdeModulePkg: Add new driver to publish EDKII_PI_SMM_COMMUNICATION_REGION_TABLE.

Add a driver to publish EDKII_PI_SMM_COMMUNICATION_REGION_TABLE, so that
other DXE driver can consume this table directly. NOTE: This is sample driver.
A platform may uses its own way to define default SMM communication buffer
region and publish information in its own
EDKII_PI_SMM_COMMUNICATION_REGION_TABLE.

This is designed to meet Microsoft WSMT table definition on FIXED_COMM_BUFFERS
requirement.

Cc: Feng Tian <feng.tian@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Feng, Tian <feng.tian@intel.com>