StandaloneMmPkg: Add EDK2 Core CI support

StandaloneMmPkg: Add EDK2 Core CI support

Bugzilla: 3150 (https://bugzilla.tianocore.org/show_bug.cgi?id=3150)

The TianoCore EDKII project has introduced a Core CI infrastructure
using TianoCore EDKII Tools PIP modules:
  * https://pypi.org/project/edk2-pytool-library/
  * https://pypi.org/project/edk2-pytool-extensions/

The edk2\.pytool\Readme.md provides information to configure the
environment and to run local builds.

This patch defines the necessary settings for enabling the Core CI
builds for StandaloneMmPkg.

Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@arm.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>