greybus: audio: Add id to identify data connection

Added id field to data connection struct. This is used to identify which
data connection to use while enabling interface between module & APB.
Signed-off-by: Vaibhav Agarwal <vaibhav.agarwal@linaro.org>
Reviewed-by: Mark Greer <mgreer@animalcreek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/audio_codec.h

@@ -129,6 +129,7 @@ struct gbaudio_control {
 };
 
 struct gbaudio_data_connection {
+	int id;
 	__le16 data_cport;
 	int cport_configured;
 	char name[NAME_SIZE];

drivers/staging/greybus/audio_module.c

@@ -199,6 +199,7 @@ static int gb_audio_add_data_connection(struct gbaudio_module_info *gbmodule,
 	greybus_set_drvdata(bundle, gbmodule);
 	/* dai->name should be same as codec->dai_name */
 	strlcpy(dai->name, "greybus-apb1", NAME_SIZE);
+	dai->id = 0;
 	dai->data_cport = connection->intf_cport_id;
 	dai->connection = connection;
 	list_add(&dai->list, &gbmodule->data_list);