Add support in showbootdata for the new firmware time keyvals.

This adds a new -f/--firmware option for reporting the
power_on_to_* keyvals.  These report timings of various firmware
phases during boot.

BUG=chromium-os:14925
TEST=use the new option on a recently generated results directory

Change-Id: I9a962db0696b4f767184d8bd8eede1af0a9a1274
Reviewed-on: http://gerrit.chromium.org/gerrit/3461
Reviewed-by: Mike Truty <truty@chromium.org>
Tested-by: Rajesh Chenna <rchenna@google.com>
Reviewed-by: Rajesh Chenna <rchenna@google.com>
3 files changed