x86/pci: Remove #ifdef __KERNEL__ guard from <asm/pci.h>

pci.h is not a UAPI header, so the __KERNEL__ ifdef is rather pointless.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20191113071836.21041-4-hch@lst.de

arch/x86/include/asm/pci.h

@@ -12,8 +12,6 @@
 #include <asm/pat.h>
 #include <asm/x86_init.h>
 
-#ifdef __KERNEL__
-
 struct pci_sysdata {
 	int		domain;		/* PCI domain */
 	int		node;		/* NUMA node */
@@ -118,7 +116,6 @@ void native_restore_msi_irqs(struct pci_dev *dev);
 #define native_setup_msi_irqs		NULL
 #define native_teardown_msi_irq		NULL
 #endif
-#endif  /* __KERNEL__ */
 
 /* generic pci stuff */
 #include <asm-generic/pci.h>