UPSTREAM: netfilter: nf_tables: remove busy mark and gc batch API

commit a2dd0233 upstream.

Ditch it, it has been replace it by the GC transaction API and it has no
clients anymore.

Bug: 299922216
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 1398a0ee)
Signed-off-by: Lee Jones <joneslee@google.com>
Change-Id: Iceb3778c964c87d8af241fb86e37291e7c29f7cd