kms_universal_plane: Add gen9-specific test

Gen9 adds some new capabilities not present on previous platforms
(primary plane windowing, 90/270 rotation, etc.).  Add a new subtest to
check how these new features interact with the use of the universal
plane API.

For now we just check whether pageflips work as expected in a windowed
setting.  We may want to add some rotation testing in future patches.

Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Thomas Wood <thomas.wood@intel.com>

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