Revert "Release MIGRATE_LOCK_ICON flag."

This reverts commit d1a90fb3.

Reason for revert: Potential culprit for b/293932777 - verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted.

Change-Id: I57940332c90b8937f7e3f5a679319e5846e964c5