Add a 'power_state' control to selected board overlays.

This adds a new software control called 'power_state' that provides
the necessary behaviors needed for Autotest to perform repair via

This is an initial phase to support just the x86-based boards
currently supported by Autotest.  The support here doesn't include
new x86-boards not already supported in the test lab, nor does it
include any ARM boards.

TEST=tested all power_state settings against link hardware

Change-Id: Idf1dbab1975e20155a1300730c57c3e0266c585e
Reviewed-by: Richard Barnette <>
Tested-by: Richard Barnette <>
Reviewed-by: Dan Shi <>
Reviewed-by: Todd Broch <>
Commit-Queue: Richard Barnette <>
12 files changed