Updates MU_FEATURE_CONFIG and MU_FEATURE_MM_SUPV to be
submodules rather then git dependencies. Additionally moves
MU_FEATURE_DFCI into the features subfolder. Updates necessary
information in the PlatformBuild files of QemuQ35Pkg an
QemuSbsaPkg.
Additionally, since QemuSbsaPkg and QemuQ35 are begging to diverge in
necessary submodules, I've changed the functions that specify to stuart
what submodules to download. Instead of downloading all submodules
available, only the submodules necessary to the individual platform is
downloaded.
8f3893d0d8