tegra: Don't force scanout allocation in _create_with_modifiers()

After the commit <TODO> ("gbm: assume USE_SCANOUT in create_with_modifiers"),
correct PIPE usage flags are always shipped to resource_create_with_modifiers(),
therefore no additional workarounds required anymore.

Signed-off-by: Roman Stratiienko <r.stratiienko@gmail.com>
103 jobs for !12402 with no-scanout-for-shared in 91 minutes and 49 seconds (queued for 5 seconds)
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