Assume that HDMI implies usage of an external display, and that we
want to try bringing up display if we can read an EDID.
BUG=chrome-os-partner:42946
BRANCH=firmware-veyron
TEST=none; need a display with corrupt EDID to test with
Signed-off-by: David Hendricks <dhendrix@chromium.org>
Change-Id: I9e22984a98b1a5f8cd9645b92dc9b87e8d968f01
Reviewed-on: https://chromium-review.googlesource.com/293608