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_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 439506c..3ef3a0d 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -231,7 +231,7 @@
 	 */
 	if (IS_eDP(intel_output))
 		aux_clock_divider = 225; /* eDP input clock at 450Mhz */
-	else if (IS_IRONLAKE(dev))
+	else if (HAS_PCH_SPLIT(dev))
 		aux_clock_divider = 62; /* IRL input clock fixed at 125Mhz */
 	else
 		aux_clock_divider = intel_hrawclk(dev) / 2;
@@ -584,7 +584,7 @@
 	intel_dp_compute_m_n(3, lane_count,
 			     mode->clock, adjusted_mode->clock, &m_n);
 
-	if (IS_IRONLAKE(dev)) {
+	if (HAS_PCH_SPLIT(dev)) {
 		if (intel_crtc->pipe == 0) {
 			I915_WRITE(TRANSA_DATA_M1,
 				   ((m_n.tu - 1) << PIPE_GMCH_DATA_M_TU_SIZE_SHIFT) |
@@ -1176,7 +1176,7 @@
 
 	dp_priv->has_audio = false;
 
-	if (IS_IRONLAKE(dev))
+	if (HAS_PCH_SPLIT(dev))
 		return ironlake_dp_detect(connector);
 
 	temp = I915_READ(PORT_HOTPLUG_EN);