CachedAppOptimizer: don't take AM lock when freezer is not enabled am: 8f5e000257

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/13546408

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I8d203ea2c92a77d155a30cf797dd75dd5cc0a918