[Installd] Clean up logic for secondary dex oat files

Add a new method to installd, reconcileSecondaryOdex, which checks if
the given dex files still exist and if not, deletes the oat files that
were generated for it.

Test: devices bots
      adb shell cmd package reconcile-secondary-dex
com.android.google.gms (after artificially/temporarily renaming some
dex files)

Bug: 32871170

(cherry picked from commit bd968360)

Change-Id: Icb5c71b43a0e531d5be5d900149e707d0fe0a8de

Merged-In: I8465a7be9fd4e44e191ad40f7bd0f41c8b2d6f73