Support direct-boot tests.

Add shell commands to check on current FBE status and system ready
status.  Mark variables without first-class locking as volatile.

Fix bug where UI automation would crash while device was locked by
marking it as forced direct-boot aware.

Bug: 26498834
Change-Id: Ib4dfb9350925e5413f93a09baacf84c62f2ba0ea
7 files changed