Delete unused Keyguard RemoteAnimations

These are no longer used, and would be dangerous if used as they drive
lock screen state but are not guaranteed to be given the animations in
all situations.

Test: atest KeyguardLockedTests
Flag: EXEMPT cleanup of flagged code
Bug: 365884835
Change-Id: If7d2ddfc8b10c4b3849cdf108c37c6c3591118c1