drm/i915: Make HAS_GMCH_DISPLAY only take dev_priv

More .rodata string saving by avoid __I915__ magic inside WARNs.

v2: Add parantheses around dev_priv. (Ville Syrjala)

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: David Weinehall <david.weinehall@linux.intel.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Jani Nikula <jani.nikula@linux.intel.com>
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>

drivers/gpu/drm/i915/intel_dp.c

@@ -1583,7 +1583,7 @@ intel_dp_compute_config(struct intel_encoder *encoder,
 				return ret;
 		}
 
-		if (HAS_GMCH_DISPLAY(dev))
+		if (HAS_GMCH_DISPLAY(dev_priv))
 			intel_gmch_panel_fitting(intel_crtc, pipe_config,
 						 intel_connector->panel.fitting_mode);
 		else