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The CL fixes the following issues:
1. When looping over pending modeset requests, do not depend on the
dynamic vector size.
2. If the display modeset has failed, do not always select the next
available mode, check that it's valid first.
3. Retry configuring displays when any of them fail, not just the last
one.
4. Use default values for unittest variables.

BUG=b/168800852
TEST=should configure multiple displays even after the first mode is
rejected. display_unittests

Change-Id: I285d02f4b7f653588b53c48655cc05514264242d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2417008Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Gil Dekel <gildekel@chromium.org>
Commit-Queue: Mark Yacoub <markyacoub@google.com>
Cr-Commit-Position: refs/heads/master@{#808472}