Restore some WiFi features.
Restore some WiFi features.

This reverts part of commit 1f99a980a66e9e286a51b4dd51e927ebb295616a.

ED6E0F17/brillo_device_raspberrypi,ED6E0F17/brillo_device_raspberrypi,ED6E0F17/brillo_device_raspberrypi