drm/i915: Make IS_GEN macros only take dev_priv

Saves 1416 bytes of .rodata strings.

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>
Link: http://patchwork.freedesktop.org/patch/msgid/1476352990-2504-1-git-send-email-tvrtko.ursulin@linux.intel.com

drivers/gpu/drm/i915/intel_lvds.c

@@ -1071,7 +1071,7 @@ void intel_lvds_init(struct drm_device *dev)
 	intel_encoder->cloneable = 0;
 	if (HAS_PCH_SPLIT(dev_priv))
 		intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
-	else if (IS_GEN4(dev))
+	else if (IS_GEN4(dev_priv))
 		intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
 	else
 		intel_encoder->crtc_mask = (1 << 1);