udev: move udev cleanup functions from udev-util.h to udev.h

src/test/test-libudev.c

@@ -5,14 +5,11 @@
 #include <sys/epoll.h>
 #include <unistd.h>
 
-#include "libudev.h"
-
 #include "fd-util.h"
+#include "libudev-private.h"
 #include "log.h"
 #include "stdio-util.h"
 #include "string-util.h"
-#include "udev-util.h"
-#include "util.h"
 
 static void print_device(struct udev_device *device) {
         const char *str;