drm/i915: Make IS_CHERRYVIEW only take dev_priv

Saves 864 bytes of .rodata strings and ~100 of .text.

v2: Add parantheses around dev_priv. (Ville Syrjala)
v3: Rebase.

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/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index e4bb85c..3a6e1a9 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -2598,7 +2598,7 @@
 		skl_display_core_init(dev_priv, resume);
 	} else if (IS_BROXTON(dev_priv)) {
 		bxt_display_core_init(dev_priv, resume);
-	} else if (IS_CHERRYVIEW(dev)) {
+	} else if (IS_CHERRYVIEW(dev_priv)) {
 		mutex_lock(&power_domains->lock);
 		chv_phy_control_init(dev_priv);
 		mutex_unlock(&power_domains->lock);