Migrate legacy ALTERNATE_BOUNCER_VIEW to aconfig

Use aconfig flag com.android.systemui.device_entry_udfps_refactor.

Test: atest SystemUITests
Bug: 279440316
Bug: 287599719
Flag: ACONFIG com.android.systemui.device_entry_udfps_refactor DEVELOPMENT
Change-Id: I6bf6af9f4fc1daa2310eebe8fbc60cf559633398
9 files changed