Add cert_chain output argument to KeyFactory. am: 6f4db7dd98 am: 90031ce657

Original change: https://android-review.googlesource.com/c/platform/system/keymaster/+/1520312

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I0ca72847c2f07f69cd784fae213dbb3d648ff147