drm/display/dp_mst: drop has_audio from struct drm_dp_mst_port

Caching the has_audio in struct drm_dp_mst_port seems odd, and oddly
placed. Defer audio handling to drivers, and use the info from the
connector display info. i915 was the only one using it anyway.
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/7d9eefdf150870479c5797f027d4c2b0a19ff583.1685437500.git.jani.nikula@intel.com

drivers/gpu/drm/display/drm_dp_mst_topology.c

@@ -4170,7 +4170,7 @@ struct edid *drm_dp_mst_get_edid(struct drm_connector *connector, struct drm_dp_
 	else {
 		edid = drm_get_edid(connector, &port->aux.ddc);
 	}
-	port->has_audio = drm_detect_monitor_audio(edid);
+
 	drm_dp_mst_topology_put_port(port);
 	return edid;
 }

drivers/gpu/drm/i915/display/intel_display_debugfs.c

@@ -244,9 +244,9 @@ static void intel_dp_info(struct seq_file *m,
 }
 
 static void intel_dp_mst_info(struct seq_file *m,
-			      struct intel_connector *intel_connector)
+			      struct intel_connector *connector)
 {
-	bool has_audio = intel_connector->port->has_audio;
+	bool has_audio = connector->base.display_info.has_audio;
 
 	seq_printf(m, "\taudio support: %s\n", str_yes_no(has_audio));
 }

drivers/gpu/drm/i915/display/intel_dp_mst.c

@@ -298,7 +298,7 @@ static bool intel_dp_mst_has_audio(const struct drm_connector_state *conn_state)
 		to_intel_connector(conn_state->connector);
 
 	if (intel_conn_state->force_audio == HDMI_AUDIO_AUTO)
-		return connector->port->has_audio;
+		return connector->base.display_info.has_audio;
 	else
 		return intel_conn_state->force_audio == HDMI_AUDIO_ON;
 }

include/drm/display/drm_dp_mst_helper.h

@@ -139,11 +139,6 @@ struct drm_dp_mst_port {
 	 * that the EDID for all connectors is read immediately.
 	 */
 	struct edid *cached_edid;
-	/**
-	 * @has_audio: Tracks whether the sink connector to this port is
-	 * audio-capable.
-	 */
-	bool has_audio;
 
 	/**
 	 * @fec_capable: bool indicating if FEC can be supported up to that