llkd: add live-lock daemon

Introduce a standalone live-lock daemon (llkd), to catch kernel
or native user space deadlocks and take mitigating actions.

Test: llkd_unit_test
Bug: 33808187
Bug: 72838192
Change-Id: If869ecd06e5ce7b04bba1dafd0a77971b71aa517
6 files changed