cifs: fix indentation in make menuconfig options

The options that are displayed for the smb3.1.1/cifs client
in "make menuconfig" are confusing because some of them are
not indented making them not appear to be related to cifs.ko
Fix that by adding an if/endif (similar to what ceph and 9pm did)
if fs/cifs/Kconfig
Suggested-by: David Howells <dhowells@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/cifs/Kconfig

@@ -175,6 +175,8 @@ config CIFS_NFSD_EXPORT
 	help
 	  Allows NFS server to export a CIFS mounted share (nfsd over cifs)
 
+if CIFS
+
 config CIFS_SMB_DIRECT
 	bool "SMB Direct support"
 	depends on CIFS=m && INFINIBAND && INFINIBAND_ADDR_TRANS || CIFS=y && INFINIBAND=y && INFINIBAND_ADDR_TRANS=y
@@ -198,3 +200,5 @@ config CIFS_ROOT
 	  Enables root file system support over SMB protocol.
 
 	  Most people say N here.
+
+endif