drm/i915: Add a for_each_intel_connector macro

We have similar macros for crtcs and encoders, and the pattern happens
often enough to justify the macro.

Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
index 9f67a37..be12492 100644
--- a/drivers/gpu/drm/i915/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/intel_dp_mst.c
@@ -58,7 +58,7 @@
 	pipe_config->pipe_bpp = 24;
 	pipe_config->port_clock = drm_dp_bw_code_to_link_rate(intel_dp->link_bw);
 
-	list_for_each_entry(intel_connector, &dev->mode_config.connector_list, base.head) {
+	for_each_intel_connector(dev, intel_connector) {
 		if (intel_connector->new_encoder == encoder) {
 			found = intel_connector;
 			break;
@@ -140,7 +140,7 @@
 	struct drm_crtc *crtc = encoder->base.crtc;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 
-	list_for_each_entry(intel_connector, &dev->mode_config.connector_list, base.head) {
+	for_each_intel_connector(dev, intel_connector) {
 		if (intel_connector->new_encoder == encoder) {
 			found = intel_connector;
 			break;