remove unused lock_cpu_hotplug_interruptible definition

aa95387774039096c11803c04011f1aa42d85758 removed the implementation of
lock_cpu_hotplug_interruptible and all users of it.  This stub definition
for !CONFIG_HOTPLUG_CPU was left over -- kill it now.

Signed-off-by: Nathan Lynch <ntl@pobox.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index 3b2df25..c2236bb 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -120,7 +120,6 @@
 
 #define lock_cpu_hotplug()	do { } while (0)
 #define unlock_cpu_hotplug()	do { } while (0)
-#define lock_cpu_hotplug_interruptible() 0
 #define hotcpu_notifier(fn, pri)	do { (void)(fn); } while (0)
 #define register_hotcpu_notifier(nb)	do { (void)(nb); } while (0)
 #define unregister_hotcpu_notifier(nb)	do { (void)(nb); } while (0)