Convert Privacy Types to use PermissionGroup icons

PrivacyType now uses the icons defined in the framework for the
permission groups.

Also, fixes icon size and min width of chip. This requires that the
icons be right aligned when there's no background so there is no extra
black space to the right of a single icons.

Remove unnecessary references to whether the device is secured as those
were only needed when exposing apps.

Still needed to change the icons in PhoneStatusBarPolicy, need to
address the sizing of icons correctly.

Bug: 129677355
Fixes: 130179014
Test: manual: changing theme changes the icon
Test: visual

Change-Id: Iededc1132caa37cca05112f635ddad8aa04e6ea4