x86: apic_XX.c declare functions before they get used

declared following smp interrupts in asm-x86/hw_irq.h:
smp_apic_timer_interrupt, smp_spurious_interrupt, smp_error_interrupt

Signed-off-by: Jaswinder Singh <jaswinder@infradead.org>
diff --git a/include/asm-x86/apic.h b/include/asm-x86/apic.h
index 133c998..519ad65 100644
--- a/include/asm-x86/apic.h
+++ b/include/asm-x86/apic.h
@@ -54,6 +54,11 @@
 #endif
 
 extern int is_vsmp_box(void);
+extern void xapic_wait_icr_idle(void);
+extern u32 safe_xapic_wait_icr_idle(void);
+extern u64 xapic_icr_read(void);
+extern void xapic_icr_write(u32, u32);
+extern int setup_profiling_timer(unsigned int);
 
 static inline void native_apic_write(unsigned long reg, u32 v)
 {