REF:https://bugzilla.tianocore.org/show_bug.cgi?id=2640
Azure Pipelines agents have 2 threads. This commit has been shown to
reduce the build time in half on those agents.
Cc: Bob C Feng <bob.c.feng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
Reviewed-by: Bob C Feng <bob.c.feng@intel.com>