igt/tests/kms_dp_tiled_display: kms test for display port tiled displays

This test validates the tiled DP displays to display a test pattern
seamlessly across the two tiles. It validates the transcoder port
sync feature on i915 to get a tearfree tiled display output.

Related kernel work patches-
https://patchwork.freedesktop.org/series/66403/

This test can eventually be extended to cover tiled display support
on other connector types.

v6:
* igt_require if enough pipes not available (Simon, Petri)
v5:
* Addresses newline nits (Simon)
* Add 2019 copyright, igt_describe (Petri)
* Check all prev connectors for pipe assignments (Simon)
* Continue if num_h_tiles = 0 (Simon)
v4:
* Add the logic to check there are
page flips per connector (Simon)
* Calloc instead of malloc to initialize (Manasi)

v3:
* Fix the pointer leaks (Simon)
* Code indentation (Manasi)
* Compare two consecutive flip timestamps (Simon)
* Use single fb across tiles (Simon)
* Fix reset mode logic (Manasi)

v2: Added a check for checking pageflip event timestamps (Simon, Manasi)
    Minor style changes (Simon)
   Code clean-up and reordering

Cc: Manasi Navare <manasi.d.navare@intel.com>
Cc: Petri Latvala <petri.latvala@intel.com>
Cc: Simon Ser <simon.ser@intel.com>
Cc: <madhumitha.tp@gmail.com>
Cc: Simon Ser <contact@emersion.fr>
Signed-off-by: Madhumitha Tolakanahalli Pradeep <madhumitha.tolakanahalli.pradeep@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Simon Ser <simon.ser@intel.com>

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