[PM] Clean up logic for secondary dex oat files

Add logic in DexManager to reconcile secondary dex records with the
actual files on disk. If secondary dex files are moved or removed then
DexManager will remove the generated oat files during the call to
reconcileSecondaryOdex() and update its internal state.

Add 'adb shell cmd package reconcile-secondary-dex packageName' which
will force DexManager to sync its data with the actual secondary dex
files.

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

Bug: 32871170

Change-Id: Id2d72dc89995f89cf1ddf79ae4e992afd3f3c127