net/mlx5e: Check for needed capability for cvlan matching

net/mlx5e: Check for needed capability for cvlan matching

BugLink: https://bugs.launchpad.net/bugs/1933691
[ Upstream commit afe93f71b5d3cdae7209213ec8ef25210b837b93 ]

If not supported show an error and return instead of trying to offload
to the hardware and fail.

Fixes: 699e96ddf47f ("net/mlx5e: Support offloading tc double vlan headers match")
Reported-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Kelsey Skunberg <kelsey.skunberg@canonical.com>