Merge "Add getKeyCharacteristics method to KeyMint" am: 8b25958b75 am: 08e40ff4cc am: c45edf9eb4

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1690690

Change-Id: I23db751a9e8448e8e85d35ff9be7199777ab9f6f