netfilter: nftables: allow to update flowtable flags

[ Upstream commit 7b35582cd04ace2fd1807c1b624934e465cc939d ]

Honor flowtable flags from the control update path. Disallow disabling
to toggle hardware offload support though.

Fixes: 8bb69f3b2918 ("netfilter: nf_tables: add flowtable offload control plane")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2 files changed