Option is long gone, see

  5d9efa7e ("ipv6: Remove privacy config option.")
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: linux-mips@linux-mips.org
Cc: LKML <linux-kernel@vger.kernel.org>
Patchwork: https://patchwork.linux-mips.org/patch/12919/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>