Merge "AttestationKey documentation" am: c46f9da49f am: 5df02652c1 am: 237ecec162 am: ff9fce151e am: 9125680878

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1674665

Change-Id: I23d40269f5dda4503912bd42f1f555fb44af820e