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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=External display doesn't pick I915...CSS modifier

Change-Id: I9d7aa06f5f9331d232a3cbd7e74bd41771bc4030
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1912460
Commit-Queue: Mark Yacoub <markyacoub@google.com>
Reviewed-by: Michael Spang <spang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715332}