Fix deadlock on CompatConfig.mChanges

Call out to PackageManager before locking mChanges.

Bug: 187514238
Test: atest FrameworksServicesTests:CompatConfigTest
Merged-In: I72b23fb4651c6efece0afb53b5dc4ca8df63dddb
Change-Id: I72b23fb4651c6efece0afb53b5dc4ca8df63dddb
2 files changed