faft: Use mode_aware_reboot instead of reboot_warm and reboot_cold

This change removes reboot_warm, reboot_cold, reboot_warm_trigger,
and reboot_cold_trigger from FAFT framework and uses the new
mode_award_reboot method which does the same job.

BUG=chrome-os-partner:16231
TEST=Ran some of the affected FAFT tests on Jerry.

Change-Id: I9f0d1fd3416c7e4a624a915507dfa9c97f16d3e0
Reviewed-on: https://chromium-review.googlesource.com/269764
Reviewed-by: Yusuf Mohsinally <mohsinally@chromium.org>
Commit-Queue: Tom Tam <waihong@google.com>
Tested-by: Tom Tam <waihong@google.com>
40 files changed