BZ:https://bugzilla.tianocore.org/show_bug.cgi?id=1872
Since MultipleWorkspace is not imported in FvImageSection,
an error of "global name 'MWS' is not defined" appeared.
This patch is going to fix that issue.
Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Zhiju.Fan <zhijux.fan@intel.com>
Reviewed-by: Bob Feng <bob.c.feng@intel.com>