[riot-notifications] [RIOT-OS/RIOT] examples/gnrc_border_route: simplify ZEP setup on native (#14755)

[benpicco]

I'm trying to reproduce the [failure of `tests/gnrc_netif_ieee802154`](https://ci.riot-os.org/RIOT-OS/RIOT/14755/0f9fe7b6ed1117375740c6f9eb480a1580363c91/output/compile/tests/gnrc_netif_ieee802154/native:gnu.txt) locally

    /tmp/dwq.0.305778657620171/0218f7b2bf1e71f3de1e9a4dd18186d8/build/tests_gnrc_netif_ieee802154.elf: open(/dev/net/tun): No such file or directory

However, on my machine `make all test` works on `native` with 

    sudo ip tuntap add tap0 mode tap user ${USER}
    sudo ip link set tap0 up

Is CI doing something different?
I don't understand how the changes result in `netdev_tap` being unable to open `/dev/net/tun`

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