Don't pass ATTEST_KEY for symmetric key generation am: 6d825fb225 am: e476c387b7

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/3375315

Change-Id: I6f016e4f90630271e2aa6c3b258385b018903497
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>