Make PasswordMetrics#computeForPasswordOrPin() private am: dc151e2b57 am: b814409850 am: 5dd1055466 am: 8f68dcd000

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

Change-Id: I5ac9fb7b28f7e00a3a526538f020e12075a5ad0c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>