headers: kobject.h redux

Remove kobject.h from files which don't need it, notably,
sched.h and fs.h.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/nilfs2/super.c

@@ -47,7 +47,6 @@
 #include <linux/crc32.h>
 #include <linux/vfs.h>
 #include <linux/writeback.h>
-#include <linux/kobject.h>
 #include <linux/seq_file.h>
 #include <linux/mount.h>
 #include "nilfs.h"