Support negative appId in Dexopter for Privacy Sandbox Sdk Libs.

After recent changes in PackageManager, these libraries have appId = -1.
This CL enables dexopt for negative ids by using Process.SYSTEM_UID as
shared gid.

Bug: 324537096
Test: PrimaryDexopterParameterizedTest, DumpHelperTest
Change-Id: I8014d14eda68c122afa238c6272423279863c06b
6 files changed