Revert "ip_tunnel: annotate data-races around t->parms.link"

This reverts commit c3c53b16 which is
commit f694eee9 upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: Ieb61f22977ab6a0cf16fa46b80083d43a0b9a553
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>