x86: Move iommu_shutdown_noop to x86_init.c

iommu_init_noop() is in arch/x86/kernel/x86_init.c but
iommu_shutdown_noop() in arch/x86/include/asm/iommu.h.

This moves iommu_shutdown_noop() to x86_init.c for consistency.
Signed-off-by: NFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
LKML-Reference: <1258199198-16657-3-git-send-email-fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/include/asm/iommu.h

 #ifndef _ASM_X86_IOMMU_H
 #define _ASM_X86_IOMMU_H
 
-static inline void iommu_shutdown_noop(void) {}
 extern struct dma_map_ops nommu_dma_ops;
 extern int force_iommu, no_iommu;
 extern int iommu_detected;

arch/x86/kernel/x86_init.c

@@ -20,6 +20,7 @@ void __cpuinit x86_init_noop(void) { }
 void __init x86_init_uint_noop(unsigned int unused) { }
 void __init x86_init_pgd_noop(pgd_t *unused) { }
 int __init iommu_init_noop(void) { return 0; }
+void __init iommu_shutdown_noop(void) { }
 
 /*
  * The platform setup functions are preset with the default functions