x86, pci: Add arch_init to x86_init abstraction

Added an abstraction function for arch specific init calls.
Signed-off-by: NJacob Pan <jacob.jun.pan@intel.com>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
LKML-Reference: <43F901BD926A4E43B106BF17856F0755A318CE84@orsmsx508.amr.corp.intel.com>
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>

arch/x86/include/asm/x86_init.h

@@ -98,13 +98,15 @@ struct x86_init_iommu {
 	int (*iommu_init)(void);
 };
 
- /*
-  * struct x86_init_pci - platform specific pci init functions
- * @init:			platform specific pci init
+/**
+ * struct x86_init_pci - platform specific pci init functions
+ * @arch_init:			platform specific pci arch init call
+ * @init:			platform specific pci subsystem init
  * @init_irq:			platform specific pci irq init
  * @fixup_irqs:			platform specific pci irq fixup
  */
 struct x86_init_pci {
+	int (*arch_init)(void);
 	int (*init)(void);
 	void (*init_irq)(void);
 	void (*fixup_irqs)(void);