Merge "Add getKeyCharacteristics method to KeyMint" am: 8b25958b75 am: 08e40ff4cc am: c45edf9eb4 am: b7d7e97f49 am: fa7082c15b

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

Change-Id: Id5e9225b1b8fa808ffc4a0d01d22f6a41ec9cc60