drm/{i915,xe}/display: add core workaround query to display parent interface

There are workarounds display needs to apply depending on information
only available to the core driver. Add a display parent interface for
the query. For starters, there's only one workaround like this, so keep
it simple instead of over-engineering.

This lets us drop an #ifdef I915 as well as xe dependency on some
display headers.

v2: git add xe_display_wa.h

v3: Add a comments about usage (Suraj)

Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Link: https://patch.msgid.link/20260803115417.1760484-1-jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

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