Add IFLA_MACVLAN_BC_QUEUE_LEN / IFLA_MACVLAN_BC_QUEUE_LEN_USED

[champtar]

It can be interesting to allow to be able to configure bcqueuelen for macvlan interface, for exemple for macvlan CNI (https://www.cni.dev/plugins/current/main/macvlan/)

This was added in Linux 5.11 https://github.com/torvalds/linux/commit/d4bff72c8401e6f56194ecf455db70ebc22929e2 https://github.com/iproute2/iproute2/commit/42f5642a40a70e2ad0a10563397d6aa714299390

While at it we can also add IFLA_MACVLAN_BC_CUTOFF, added in linux 6.4 https://github.com/torvalds/linux/commit/954d1fa1ac93aa8a66f7d9a9ba545cf7f020d348 https://github.com/iproute2/iproute2/commit/e8a3fb470b4e96aa35a2731c7cc175b946c0a62d