Use a single binary for setting up wifi.

There was a case where using separate ip link add and rename_netiface
commands would fail when the initial rename_netiface took too long. This
solves that by makign the operations sequential in the same binary.

This is a simplified version of aosp/772734, without the optional vlan
logic.

Bug: 119771992
Test: Ran phone target, checked if wifi worked
Change-Id: Ie6e472be0831fae2039d14d6c947235b5318603f