Moved more stuff from ActivityManagerService to ActivityTaskManagerService (15/n)

- Moved CompatModePackages to ActivityTaskManagerService since it is mostly used for activity stuff.
- Moved mHeavyWeightProcess to ActivityTaskManagerService since it is set for activities.
- Set AMS.mBooting and AMS.mBooted as volatile to allow setting from both AM and WM side with hold locks.
- Allow updating of cpu stats, usage stats, and foreground time from WM side.

Bug: 80414790
Test: Existing tests pass.
Change-Id: I48ab55bdd5aacc864cb6a82d19d1a24b7605a5b0