Don't manage whitelisted plugins

Add sysui to the plugin whitelist and don't manage whitelisted plugins.
This will prevent sysui getting all its components disabled when it
crashes if we have a plugin compiled into the APK, which we now support.

Bug: 118403466
Test: added test
Change-Id: I1f65ae44db686e718e23bf1d9f4c06d0ba16056a