Use either DP or HDMI ports, whichever available.

We have been using devices that have chameleon connected to hdmi
to run our tests.

We can widen the pool of devices by utilizing DP ports as well.

In code, use whatever port that was found.

We still run inside a pool, if you don't want to use something like
VGA just don't add the VGA device into the pool.

BUG=None.
TEST=None.

Change-Id: Ie2ec076883093655248febf1a3e51bc14925858e
Reviewed-on: https://chromium-review.googlesource.com/327734
Commit-Ready: Mussa Kiroga <mussa@chromium.org>
Tested-by: Mussa Kiroga <mussa@chromium.org>
Reviewed-by: Rohit Makasana <rohitbm@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/327845
Reviewed-by: Mussa Kiroga <mussa@chromium.org>
9 files changed