[CIFS] enable parsing for transport encryption mount parm

Samba now supports transport encryption on particular exports
(mounted tree ids can be encrypted for servers which support the
unix extensions).  This adds parsing support to cifs mount
option parsing for this.

Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index b7d9f69..0891405 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -281,6 +281,7 @@
 	bool ipc:1;		/* set if connection to IPC$ eg for RPC/PIPES */
 	bool retry:1;
 	bool nocase:1;
+	bool seal:1;      /* transport encryption for this mounted share */
 	bool unix_ext:1;  /* if false disable Linux extensions to CIFS protocol
 				for this mount even if server would support */
 	/* BB add field for back pointer to sb struct(s)? */