dm vdo thread-utils: cleanup included headers

Signed-off-by: Mike Snitzer <[e-mail]>
Signed-off-by: Matthew Sakai <[e-mail]>

drivers/md/dm-vdo/logger.c

···
 #include <linux/printk.h>
 #include <linux/sched.h>
 
+#include "errors.h"
 #include "thread-device.h"
 #include "thread-utils.h"
 

drivers/md/dm-vdo/thread-utils.c

···
 
 #include "thread-utils.h"
 
-#include <linux/completion.h>
 #include <linux/delay.h>
-#include <linux/err.h>
 #include <linux/kthread.h>
+#include <linux/mutex.h>
+#include <linux/types.h>
 
 #include "errors.h"
 #include "logger.h"

drivers/md/dm-vdo/thread-utils.h

···
 #define THREAD_UTILS_H
 
 #include <linux/atomic.h>
-#include <linux/delay.h>
-#include <linux/jiffies.h>
-#include <linux/mutex.h>
-#include <linux/semaphore.h>
-
-#include "errors.h"
 
 /* Thread and synchronization utilities */