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This reverts commit 48d1ecaf.

Reason for revert: This CL causes several problems documented at crbug.com/821944

Original change's description:
> ozone/drm: Render primary framebuffers as RGBA
> 
> In preparation for hardware plane underlay support in ChromeOS, we
> need to allow for RGBA primary framebuffers. When using an underlay,
> we cut out a transparent rectangle in the primary framebuffer to allow
> the underlay to show through, while still allowing for RGBA content on
> top of the underlay (for example, video controls or annotations).
> When not using an underlay, the primary framebuffer will be displayed
> as RGBX (opaque) to avoid unnecessary blending in the display
> controller.
> 
> Bug: 789288
> Change-Id: I2fc94e524e250ec9b7e11cd6801e1c8308046a10
> Reviewed-on: https://chromium-review.googlesource.com/801974
> Reviewed-by: Alex Sakhartchouk <alexst@chromium.org>
> Reviewed-by: Stéphane Marchesin <marcheu@chromium.org>
> Reviewed-by: David Reveman <reveman@chromium.org>
> Reviewed-by: danakj <danakj@chromium.org>
> Reviewed-by: Antoine Labour <piman@chromium.org>
> Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
> Commit-Queue: Kristian H. Kristensen <hoegsberg@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#542877}

TBR=marcheu@chromium.org,reveman@chromium.org,sky@chromium.org,danakj@chromium.org,alexst@chromium.org,dcastagna@chromium.org,piman@chromium.org,hoegsberg@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 789288
Change-Id: I3005e3cb37a1385c5a1cd72bad76d1ffbad1cc63
Reviewed-on: https://chromium-review.googlesource.com/965721Reviewed-by: Nicolás Peña Moreno <npm@chromium.org>
Commit-Queue: Nicolás Peña Moreno <npm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543627}