Revert "privapps-permission: Make REQUEST_NETWORK_SCORES a privilged permission"

This reverts commit 82f37f83.

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: 145114247
Change-Id: I993dd4d35cc280afe6dc044fa1dee0ea268f9bca