reboot: remove -stable friendly PF_THREAD_BOUND define

Remove the prior patch's #define for easier backporting to the stable
releases.

Signed-off-by: Robin Holt <holt@sgi.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Russ Anderson <rja@sgi.com>
Cc: Robin Holt <holt@sgi.com>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/sys.c

@@ -362,11 +362,6 @@ int unregister_reboot_notifier(struct notifier_block *nb)
 }
 EXPORT_SYMBOL(unregister_reboot_notifier);
 
-/* Add backwards compatibility for stable trees. */
-#ifndef PF_NO_SETAFFINITY
-#define PF_NO_SETAFFINITY		PF_THREAD_BOUND
-#endif
-
 static void migrate_to_reboot_cpu(void)
 {
 	/* The boot cpu is always logical cpu 0 */