smb: client: rename cifs_dfs_ref.c to namespace.c

The automount code will handle both DFS links and reparse files that
are mount points.
Signed-off-by: Paulo Alcantara (SUSE) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/smb/client/Makefile

@@ -21,7 +21,7 @@ cifs-$(CONFIG_CIFS_XATTR) += xattr.o
 
 cifs-$(CONFIG_CIFS_UPCALL) += cifs_spnego.o
 
-cifs-$(CONFIG_CIFS_DFS_UPCALL) += cifs_dfs_ref.o dfs_cache.o dfs.o
+cifs-$(CONFIG_CIFS_DFS_UPCALL) += namespace.o dfs_cache.o dfs.o
 
 cifs-$(CONFIG_CIFS_SWN_UPCALL) += netlink.o cifs_swn.o