Merge "KeyMint VTS: don't combine ATTEST_KEY with SIGN" am: 4f51da1c9e am: bc899371f4 am: e230fd076e am: d379450115

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/1877245

Change-Id: I7167e66d22d4dc3a348135d6f55a532284b1d070