Add trace instant for updateProcessState.

It's terribly useful for debugging behaviors that are process state
specific. Leave some breadcrumbs in the trace to help with that.

Bug: 397773533
Bug: 367378950
Test: Boot device, take a trace, confirm it has the new instants.
Flag: EXEMPT log only update
Change-Id: I012b0e83ececd71e9d52c2f8e0e945cc44731865