Use calling package name for CompatChange.

For shared UID the calling package name is require to determine the
correct target SDK.

This keeps BAL enabled for system processes that were allowed to do BAL
before U.

Change-Id: Ib4576f8e229a1fcd870ef7d2f02943d24839e4fe
Test: atest BackgroundActivityLaunchTest ActivityStarterTests
Bug: 281124275
5 files changed