Make PasswordMetrics#computeForPasswordOrPin() private am: dc151e2b57 am: b814409850

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2775384

Change-Id: I99749a26be84c63092d5606989e1983cd38fb290
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>