BaseTools/GenFw: recognize MM file types as EFI Boot Service Drivers.
PI v1.5 Specification Volume 4 defines Management Mode Core Interface.
In order to support Management Mode Core Interface, Module Types
MM_STANDALONE, MM_CORE_STANDALONE are needed.
This patch ensures that MM_STANDALONE, MM_CORE_STANDALONE Modules are
treated as EFI Boot Service Driver in GenFw tool.