drm/i915: Make IS_SKYLAKE only take dev_priv

Saves 1016 bytes of .rodata strings and couple hundred of .text.

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>
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 40b86dc..a354d0e 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2659,7 +2659,7 @@
 #define IS_CHERRYVIEW(dev)	(INTEL_INFO(dev)->is_cherryview)
 #define IS_HASWELL(dev_priv)	((dev_priv)->info.is_haswell)
 #define IS_BROADWELL(dev_priv)	((dev_priv)->info.is_broadwell)
-#define IS_SKYLAKE(dev)	(INTEL_INFO(dev)->is_skylake)
+#define IS_SKYLAKE(dev_priv)	((dev_priv)->info.is_skylake)
 #define IS_BROXTON(dev)		(INTEL_INFO(dev)->is_broxton)
 #define IS_KABYLAKE(dev_priv)	((dev_priv)->info.is_kabylake)
 #define IS_MOBILE(dev)		(INTEL_INFO(dev)->is_mobile)