x86: make set_cpu_sibling_map nonstatic

And move its extern definition to smp.h, the common header

Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/include/asm-x86/smp.h b/include/asm-x86/smp.h
index 2ab8ed4..1b4481a 100644
--- a/include/asm-x86/smp.h
+++ b/include/asm-x86/smp.h
@@ -22,6 +22,9 @@
 				      int wait);
 };
 
+/* Globals due to paravirt */
+extern void set_cpu_sibling_map(int cpu);
+
 #ifdef CONFIG_SMP
 extern struct smp_ops smp_ops;