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On a hotplug event we configure the displays regardless of the state.
However if we're in software mirror mode the configuration was skipped
if the previous configuration was extended mode.

We want to have a consistent approach to display configuration, so make
sure we configure the displays if the configuration was triggered by a
system event. Otherwise (if the configuration was requested by the user)
we'll just skip the configuration so we don't perform unnecessary
modesets.

BUG=488736

Review URL: https://codereview.chromium.org/1133743005

Cr-Commit-Position: refs/heads/master@{#330534}