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This is a reland of ce767464

Original change's description:
> [Ozone-DRM] Refactor plane management and add tests
>
> * We use plane properties on legacy DRM to get some details (plane
> type, in_formats). Read the properties in HardwareDisplayPlane and
> check that the required properties are available in DRM atomic.
> * Split dummy plane into its own class to clean up code.
> * Remove test plane since we can now create the real objects via
> injected state in DrmDevice.
> * Cleanup plane initialization.
> * Remove MockHardwareDisplayPlaneManager and rely on MockDrmDevice to
> inject the necessary state.
>
> BUG=839487
> TEST=Ran unittests
>
> Change-Id: I03c91620557dcf7426629cf97bb989d8d7e83c68
> Reviewed-on: https://chromium-review.googlesource.com/1048585
> Commit-Queue: Daniel Nicoara <dnicoara@chromium.org>
> Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#561616}

Bug: 839487
Change-Id: Ifb74647dfe1f05ef3339261dd1f7c51c0c371622
Reviewed-on: https://chromium-review.googlesource.com/1073487Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Commit-Queue: Daniel Nicoara <dnicoara@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561949}