Don't require UNKNOWN_ERROR

Negative test cases should not expect UNKNOWN_ERROR from Keymint since
the exact cause of failure is known.

In general, we should avoid UNKNOWN_ERROR because it makes error
attribution difficult.

To avoid adding retroactive requirements KM implementation, relax the
check to expect any error.

Bug: 298194325
Test: VtsAidlKeyMintTargetTest
Change-Id: I136fb6d36ae92c9e3722ffefe9a067d3515dcbf9