Reapply "network: add "mac" to alternatives name policy by default"

Reapply "network: add "mac" to alternatives name policy by default"

This reverts commit 152c8946b3a93bb2c086568832d614cb54f11e13.

The kernel patch
https://lore.kernel.org/linux-usb/20240605153340.25694-1-gmazyland@gmail.com/
is now in net-next branch, and will be hopefully merged soon.

Note that Debian's 73-usb-net-by-mac.link now also supports the kernel patch:
https://salsa.debian.org/systemd-team/systemd/-/commit/c1afbb2dc295929085be86072c7942c8517ec598

So, hopefully, the change is ready. Let's reapply it.