Revert "Add a new wifi protection level"

This reverts commit 73266f2f.

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: I234510b96ddd39f64f74eb0573963365f9ff5556