Revert "Sysui/WifiTracker: Changes to support late starting wifi service"

This reverts commit e01f30b6.

Reason for revert: Wifi services no longer plan to be a separate
APK/process for mainline. Will instead become a jar loaded from Apex.

Bug: 144722612
Test: Device boots up & connects to wifi networks.
Change-Id: Iad48a59ff397ba61fac77a4c3c296190b7c70ee5