drm/xe/kunit: Build DP link display tests

Hook the shared i915 display DP link KUnit tests into the xe display
test build.

Build the shared display test source from the i915 display test directory

drm/xe/kunit: Build DP link display tests

Hook the shared i915 display DP link KUnit tests into the xe display
test build.

Build the shared display test source from the i915 display test directory
when xe display support is enabled.

v2: Unchanged.
v3: Add SPDX license header. (Michał)

Reviewed-by: Michał Grzelak <michal.grzelak@intel.com>
Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patch.msgid.link/20260707124849.135319-2-imre.deak@intel.com

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