Allow parsing vers=3.11 on cifs mount

Parses and recognizes "vers=3.1.1" on cifs mount and allows sending
0x0311 as a new CIFS/SMB3 dialect. Subsequent patches will add
the new negotiate contexts and updated session setup

Reviewed-by: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: Steve French <steve.french@primarydata.com>
diff --git a/fs/cifs/Kconfig b/fs/cifs/Kconfig
index a2172f3..e7b478b 100644
--- a/fs/cifs/Kconfig
+++ b/fs/cifs/Kconfig
@@ -192,6 +192,15 @@
 	  options are also slightly simpler (compared to CIFS) due
 	  to protocol improvements.
 
+config CIFS_SMB311
+	bool "SMB3.1.1 network file system support (Experimental)"
+	depends on CIFS_SMB2 && INET
+
+	help
+	  This enables experimental support for the newest, SMB3.1.1, dialect.
+	  This dialect includes improved security negotiation features.
+	  If unsure, say N
+
 config CIFS_FSCACHE
 	  bool "Provide CIFS client caching support"
 	  depends on CIFS=m && FSCACHE || CIFS=y && FSCACHE=y