selftests: mlxsw: Test matchall failure with protocol match

The driver can only offload matchall rules that do not match on a
protocol. Test that matchall rules that match on a protocol are vetoed.

Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>