cifs: update mnt_cifs_flags during reconfigure

Many mount flags (e.g. for noperm, noxattr, nobrl,
cifsacl, mfsymlinks and more) can be updated now.
Signed-off-by: NRonnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: NSteve French <stfrench@microsoft.com>

fs/cifs/fs_context.c

@@ -705,6 +705,7 @@ static int smb3_reconfigure(struct fs_context *fc)
 
 	smb3_cleanup_fs_context_contents(cifs_sb->ctx);
 	rc = smb3_fs_context_dup(cifs_sb->ctx, ctx);
+	smb3_update_mnt_flags(cifs_sb);
 
 	return rc;
 }