wifi: update services

*don't wait for a control interface monitor before starting
*remove p2p for now - properly fix wifi direct later
*add supplicant config overlay
*add entropy, switch to class main, etc

Change-Id: Id8d154b2bf76341fc7f6b1473ae4da9b03710a75
init: misc cleanups

This reverts commit a660b086ac749340abc8df7c52d7b3ccb886c605
and some more.

Change-Id: Ibacdc14239c85632bdf0a92c6fbbe942db6770ae