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This reverts commit 28d8162b.

Reason for revert: Getting DRM connector causes a significant delay when
HDMI is connector to Kled. This code is not in use at the moment as
Rendering Buffer Compression is not currently enabled on Intel devices.

Original change's description:
>Disable Render Buffer Compression on external displays.
>
>When Getting format modifiers, exclude I915_FORMAT_MOD_Y*_TILED_CCS
>(Intel color control surface (CCS) for render compression) if it's not
>an internal display.
>This solves the bandwidth issue when driving more than 1 4K monitor with
>rbc enabled.
>
>BUG=996011,996036,994341,979736
>TEST=HardwareDisplayControllerTest.ModifiersWithConnectorType
>
>Change-Id: I31ce046fb20557eb66340bdf131efa1437bd7484
>Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1918941
>Commit-Queue: Mark Yacoub <markyacoub@google.com>
>Commit-Queue: Daniele Castagna <dcastagna@chromium.org>
>Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
>Cr-Commit-Position: refs/heads/master@{#715717}

BUG=979736,b/146874982

Change-Id: I3083e08501ef91cb395c4e2f3940d0a5cbcfd1de
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2159758Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Commit-Queue: Mark Yacoub <markyacoub@google.com>
Cr-Commit-Position: refs/heads/master@{#761960}