drm/xe/display: Implement display support

As for display, the intent is to share the display code with the i915
driver so that there is maximum reuse there.

We do this by recompiling i915/display code twice.
Now that i915 has been adapted to support the Xe build, we can add
the xe/display support.

This initial work is a collaboration of many people and unfortunately
this squashed patch won't fully honor the proper credits.
But let's try to add a few from the squashed patches:

Co-developed-by: Matthew Brost <[email protected]>
Co-developed-by: Jani Nikula <[email protected]>
Co-developed-by: Lucas De Marchi <[email protected]>
Co-developed-by: Matt Roper <[email protected]>
Co-developed-by: Mauro Carvalho Chehab <[email protected]>
Co-developed-by: Rodrigo Vivi <[email protected]>
Co-developed-by: Dave Airlie <[email protected]>
Signed-off-by: Maarten Lankhorst <[email protected]>
Signed-off-by: Rodrigo Vivi <[email protected]>
Signed-off-by: Lucas De Marchi <[email protected]>

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