Record usage information per split

Increase the granularity of usage information to store data on each split
separately.

Now, splits get their own useByOtherApps flag and can be compiled
speed-profile when only the primary apk is loaded by other apps.

Bug: 64124380
Test: runtest -x
services/tests/servicestests/src/com/android/server/pm/dex/*

Change-Id: Ibf9e7b9e67db9c6f0f45dc695bce8fbeb7be20ae