Disable hibernation toggle in Permissions if not eligible

In order to not give users a useless toggle, we disable the toggle
if the app is not eligible.

We also combine the logic for getting hibernation eligibility into one
place to ensure we aren't duplicating the same logic.

Bug: 221971321
Test: check toggle for eligible app, exempt app, and exempt by user
Change-Id: Ib64d51473fba9a637ebf09629741608408c41679