drm/i915: More s/IS_IRONLAKE/HAS_PCH_SPLIT for Sandybridge.

I think this is pretty much correct.  Not really tested.

Signed-off-by: Eric Anholt <eric@anholt.net>
diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c
index 8673c73..fcc753c 100644
--- a/drivers/gpu/drm/i915/intel_i2c.c
+++ b/drivers/gpu/drm/i915/intel_i2c.c
@@ -128,7 +128,7 @@
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
-	if (IS_IRONLAKE(dev)) {
+	if (HAS_PCH_SPLIT(dev)) {
 		I915_WRITE(PCH_GMBUS0, 0);
 	} else {
 		I915_WRITE(GMBUS0, 0);