If you are on 4.3 it doesn't show up unless Enabled, if you are rooted and on 4.3 then you can use Disable Service to disable the notification service through that app. If on 4.1 then it shows when both Enabled AND Disabled so then you can use that same app if rooted to disable the Noti Service. Now, if you aren't rooted then all you need to do is go ahead and Force Stop the app through Settings but will have to Force Stop every time the Status of the Power Management changes. Going this route, same as with the rooted method, will still Power Management and Power Saver to run but not show the Noti Icon.
Sprint HTC One(Unrooted)
Upgraded From Sprint Galaxy SIII, HTC EVO 4G LTE and Google Nexus 4 16GB(Unlocked)