Merge "Add getKeyCharacteristics stub to KeyMint" am: e50e545fd0 am: 3636cc0ad7 am: 8f8579e09d

Original change: https://android-review.googlesource.com/c/platform/system/keymaster/+/1691318

Change-Id: Ie7bab7d8ab6d0537dec3cfb7116a487ae82f6780