Merge "Attempt to clear memory after keyguard PIN entry" into sc-dev am: f16b3f76aa am: e0f027aff9

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15502355

Change-Id: I5758f72e763bbd0efd6ddb1debdf4d7faee5b9f9