drm/xe: display support should not depend on EXPERT

Remove the DRM_XE_DISPLAY config dependency on EXPERT. I can only
presume the idea was only experts should be able to disable it, but the
effect is the opposite.

Reported-by: Eero Tamminen <eero.t.tamminen@intel.com>
Reviewed-by: Francois Dugast <francois.dugast@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240111104716.3548744-1-jani.nikula@intel.com