nls: Hide new NLS_UCS2_UTILS

NLS_UCS2_UTILS is an option selected by filesystems that need it,
don't expose it to users.

Fixes: 089f7f591348 ("fs/smb: Swing unicode common code from smb->NLS")
Suggested-by: Linus Torvalds <[e-mail]>
Signed-off-by: Dr. David Alan Gilbert <[e-mail]>
Signed-off-by: Steve French <[e-mail]>

fs/nls/Kconfig

···
 	  the Unicode/ISO9646 universal character set.
 
 config NLS_UCS2_UTILS
-	tristate "NLS UCS-2 UTILS"
-	help
-	  Set of older UCS-2 conversion utilities and tables used by some
-	  filesystems including SMB/CIFS.  This includes upper case conversion
-	  tables. This will automatically be selected when the filesystem
-	  that uses it is selected.
+	tristate
 
 endif # NLS