Stop reporting keyboard recovery switch
Stop reporting keyboard recovery switch

This uses the new keyboard recovery EC event to determine when
keyboard recovery is requested.  It is paired with a change to the EC
to stop reporting keyboard recovery as a switch, since that didn't
provide a good mechanism for the AP to tell the EC to stop reporting
the switch value.

This REQUIRES an updated BIOS; without it you won't be able to get
into recovery mode manually.  You'll need to press space at the
developer screen, or use the debug console to request recovery.  Your
BIOS must have https://gerrit.chromium.org/gerrit/27509.

BUG=chrome-os-partner:10034
TEST=manual

1. boot using power+refresh+esc.  See insert screen.
2. power button to power off
3. power button to power on.  Boots to Chrome OS (not insert screen).

Change-Id: I699ce004ed1190044170c4ea810b8969b40f523b
Signed-off-by: Randall Spangler <62698fdbb84d1779579ee80c3f39fac22017e5bc@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/27508
Reviewed-by: Bill Richardson <129945214b1d548d8e49b6c29c43094f8c78057f@chromium.org>

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