drm/i915: Stop pretending VLV has rc6+

It wasn't ever used by the caller anyway with the exception of what we
show in sysfs.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Deepak S <deepak.s@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
[danvet: Apply Deepak's suggestion.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_pm.c

@@ -3222,10 +3222,10 @@ int intel_enable_rc6(const struct drm_device *dev)
 	if (INTEL_INFO(dev)->gen == 5)
 		return 0;
 
-	if (IS_IVYBRIDGE(dev) || IS_VALLEYVIEW(dev))
+	if (IS_IVYBRIDGE(dev))
 		return (INTEL_RC6_ENABLE | INTEL_RC6p_ENABLE);
-	else
-		return INTEL_RC6_ENABLE;
+
+	return INTEL_RC6_ENABLE;
 }
 
 static void gen6_enable_rps_interrupts(struct drm_device *dev)