Fix PackageManagerPerfTest with permission cache

Permission cache's been enabled on PackageManagerPerfTest. That means
it's measuring the performance of reading the cache, not the API on
system_server.

This CL disables permission caches for an app before testing.

Bug: 349702715
Test: atest PackageManagerPerfTests:android.os.PackageManagerPerfTest
Change-Id: I40d99e78dcddb98dd057e65f389e93b1ecb5d0c5
1 file changed