x86: move pda related declaration

pda has its own header file as well.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/include/asm-x86/pda.h b/include/asm-x86/pda.h
index 35962bbe..3d9dd65 100644
--- a/include/asm-x86/pda.h
+++ b/include/asm-x86/pda.h
@@ -40,6 +40,7 @@
 
 extern struct x8664_pda *_cpu_pda[];
 extern struct x8664_pda boot_cpu_pda[];
+extern void pda_init(int);
 
 #define cpu_pda(i) (_cpu_pda[i])