umap_sync is empty and is identical to vfs_stdsync. Remove it and use generic function instead.
umap_sync is empty and is identical to vfs_stdsync. Remove it and
use generic function instead.

Approved by:	obrien

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase