selftests/bpf: Create the vxlan devices of test_tunnel with their MAC

The vxlan tests of test_tunnel create a tunnel device in the initial
netns with "ip link add", and then give it the MAC address that the
static neighbor entry at the other end points to with "ip link set".

systemd-udevd assigns new devices of the initial netns a MAC address of
its own, following its MACAddressPolicy, when it handles their uevent.
When it gets to that after the test set the address, the replies sent
to the configured MAC are dropped as meant for another host, and the
ping of vxlan_tunnel fails after 10 seconds.

Pass the address to "ip link add". udevd leaves alone the address of a
device that was created with one.

Fixes: 1ee7efd40abf ("selftests/bpf: Move vxlan tunnel testcases to test_progs")
Signed-off-by: Qiliang Yuan <odys.yuan@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20261009-selftests-bpf-tunnel-vxlan-mac-v1-1-624dd769c334@gmail.com

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