Merge "KeyMint VTS: ATTEST_KEY has no other purpose" am: a67b0441fe am: 02c4ee0dca am: 35392ef70e

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1844276

Change-Id: Ia77411d469b6a291ec333ea27150c5eef8eb2ac1