[tock] Signal test failures from kernel error handlers.

### Description

Tock's app fault, kernel fault, and kernel panic handlers should emit error messages that opentitanlib recognizes (i.e. [`Status`](https://github.com/lowRISC/opentitan/blob/master/sw/host/opentitanlib/src/test_utils/status.rs)).

Start with opentitanlib/src/test_utils/status.rs to see which error messages Status recognizes, then locate Tock's app fault, kernel fault, and kernel panic handlers. Done means each handler emits a message that opentitanlib recognizes and the affected tests pass.

Written by the indexing model from the issue text.