Merge "Avoid SIGSEGV if attest key generation fails." am: 14604af9d1 am: b07682e3db am: 7f3d007475 am: 69946003de

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1915277

Change-Id: I562a3b420110b7b1450e5d3159deacd1fe6bef31