Merge "Updated keyguard_pin_view to use a ConstraintLayout." into sc-v2-dev am: a8813c12da am: d7a0bdbafc

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15302107

Change-Id: I1c00f4ed8e936c18ae807042e6127897a793aed7