Revert "Release MIGRATE_LOCK_ICON"

Revert submission 25007252-release_migrate_split_keyguard_bottom_area

Reason for revert: Droidfood blocking bug: b/306101773

Reverted changes: /q/submissionid:25007252-release_migrate_split_keyguard_bottom_area
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:726df815a50c968f8d93a4a75e9c05dc61c5d6f6)
Merged-In: Ica2d455d9f45ba73c68a1c88eed6a8200f006bbb
Change-Id: Ica2d455d9f45ba73c68a1c88eed6a8200f006bbb