Cleanup support for multiple PIN views

Had to support both old/new UX for PIN for a while. Cleanup the
unneeded code and simply the ripple.

Fixes: 187340770
Test: atest KeyguardPinBasedInputViewControllerTest and visual check
Change-Id: Ie12cd93c7aaba5a3ef172792a5dd2a41f2196447
9 files changed