BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=1302
This patch enable --genfds-multi-thread to default build.
This patch keep --genfds-multi-thread build option for
compatibility and also add a new build option to disable
genfds-multi-thread as --no-genfds-multi-thread.
Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Bob Feng <bob.c.feng@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>