S-ACM entry ver 0x200 does not contain requested FMS&mask

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4198



After commit 1e1e35bb,
FIT Type 2 ACM entry is not generated as expected with given -I arguments.
FMS/FMS value is overridden by GetAcmFms().

This patch detects whether FMS/FMS Mask is already assigned
with -I argument. If it's not zero, skip invoking GetAcmFms().

Signed-off-by: Dakota Chiang <dakota.chiang@intel.com>
Reviewed-by: Bob Feng <bob.c.feng@intel.com>

Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Jason1 Lin <jason1.lin@intel.com>
Cc: Rahul R Kumar <rahul.r.kumar@intel.com>