Correct cephfsplugin binary path
Correct cephfsplugin binary path

Makefile has a wrong path to `deploy/cephfs/docker/rbdplugin`. This
patch changes to `deploy/cephfs/docker/cephfsplugin`.

ceph/ceph-csi,ceph/ceph-csi,ceph/ceph-csi,ceph/ceph-csi