greybus: remove unused prototypes from header

Remove a couple of unused function prototypes from the greybus header
file.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/greybus.h

@@ -155,9 +155,6 @@ struct dentry *gb_debugfs_get(void);
 
 extern struct bus_type greybus_bus_type;
 
-int gb_uart_device_init(struct gb_connection *connection);
-void gb_uart_device_exit(struct gb_connection *connection);
-
 int svc_set_route_send(struct gb_bundle *bundle,
 			       struct greybus_host_device *hd);