[efi] Rename efi_pci.h to efi_pci_api.h

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/include/ipxe/efi/efi_pci.h → src/include/ipxe/efi/efi_pci_api.h

-#ifndef _IPXE_EFI_PCI_H
-#define _IPXE_EFI_PCI_H
+#ifndef _IPXE_EFI_PCI_API_H
+#define _IPXE_EFI_PCI_API_H
 
 /** @file
  *
  */
 static inline __always_inline int
 PCIAPI_INLINE ( efi, pci_num_bus ) ( void ) {
-	/* No way to work this out via EFI */
-	return 0x100;
+	/* EFI does not want us to scan the PCI bus ourselves */
+	return 0;
 }
 
 /**
 			      value );
 }
 
-#endif /* _IPXE_EFI_PCI_H */
+#endif /* _IPXE_EFI_PCI_API_H */

src/include/ipxe/pci_io.h

 	PROVIDE_SINGLE_API_INLINE ( PCIAPI_PREFIX_ ## _subsys, _api_func )
 
 /* Include all architecture-independent I/O API headers */
-#include <ipxe/efi/efi_pci.h>
+#include <ipxe/efi/efi_pci_api.h>
 
 /* Include all architecture-dependent I/O API headers */
 #include <bits/pci_io.h>