[pm] Fix missing locks in PackageManagerService

Also fixing some ErrorProne complaints.

BUG: 222104133
Test: m RUN_ERROR_PRONE=true framework services.core |& grep
PackageManagerService
Change-Id: I9612c22839e62125db9ea42e081f4813d8591e55
Merged-In: I9612c22839e62125db9ea42e081f4813d8591e55
2 files changed