drm/msm/hdmi: disallow interlaced

So after clarification from qcom, it seems mdp4 and mdp5 support
*de*interlacing but not generating an interlaced signal.  Which would
explain why interlaced modes never worked properly.

So disable in the one connector which was claiming to support
interlaced.
Signed-off-by: Rob Clark <robdclark@gmail.com>

drivers/gpu/drm/msm/hdmi/hdmi_connector.c

@@ -426,7 +426,7 @@ struct drm_connector *hdmi_connector_init(struct hdmi *hdmi)
 	connector->polled = DRM_CONNECTOR_POLL_CONNECT |
 			DRM_CONNECTOR_POLL_DISCONNECT;
 
-	connector->interlace_allowed = 1;
+	connector->interlace_allowed = 0;
 	connector->doublescan_allowed = 0;
 
 	drm_connector_register(connector);