Merge "Fully remove startPacSystem() and stopPacSystem()" am: c7b4009f3e am: a93a01f9eb am: b803e8bf8d am: 5ce6155d18 am: fdabd6120c

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1229603

Change-Id: I509954f29bd0ae42382ccc5d3a309cb5dd00ee2d