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Add tests to verify atomic props have been set after modeset/Disable

Extend HardwareDisplayControllerTest to make sure every assigned
prop has been correctly committed at modeset/disable for crtc, connector and plane.

BUG=1082882,1136610
TEST=HardwareDisplayControllerTest.{CrtcPropsAfterModeset,
ConnectorPropsAfterModeset, PlanePropsAfterModeset,
CheckDisableResetProps}

Change-Id: Ifc9a00c5d5991f0d5dea5190865aaeccdd0f5537
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2488363
Commit-Queue: Mark Yacoub <markyacoub@google.com>
Reviewed-by: Gil Dekel <gildekel@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821763}