x86: move pda related declaration

pda has its own header file as well.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

include/asm-x86/pda.h

@@ -40,6 +40,7 @@ struct x8664_pda {
 
 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])
 

include/asm-x86/proto.h

@@ -9,7 +9,6 @@ struct cpuinfo_x86;
 struct pt_regs;
 
 extern void start_kernel(void);
-extern void pda_init(int); 
 
 extern void early_idt_handler(void);