PCI: Stub __pci_ioport_map() for arches that don't support it at all

When building OpenRISC PCI, which has no ioport_map(), we get the following
build error:

  lib/pci_iomap.c: In function 'pci_iomap_range':
    CC      drivers/i2c/i2c-core-base.o
  ./include/asm-generic/pci_iomap.h:29:41: error: implicit declaration of function 'ioport_map'; did you mean 'ioremap'? [-Werror=implicit-function-declaration]
     29 | #define __pci_ioport_map(dev, port, nr) ioport_map((port), (nr))
	|                                         ^~~~~~~~~~
  lib/pci_iomap.c:44:24: note: in expansion of macro '__pci_ioport_map'
     44 |                 return __pci_ioport_map(dev, start, len);
	|                        ^~~~~~~~~~~~~~~~

Add a NULL definition of __pci_ioport_map() for architectures that do not
support ioport_map().

Suggested-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20220722212248.802500-1-shorne@gmail.com
Signed-off-by: Stafford Horne <shorne@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

include/asm-generic/pci_iomap.h

@@ -25,6 +25,8 @@ extern void pci_iounmap(struct pci_dev *dev, void __iomem *);
 #ifdef CONFIG_NO_GENERIC_PCI_IOPORT_MAP
 extern void __iomem *__pci_ioport_map(struct pci_dev *dev, unsigned long port,
 				      unsigned int nr);
+#elif !defined(CONFIG_HAS_IOPORT_MAP)
+#define __pci_ioport_map(dev, port, nr) NULL
 #else
 #define __pci_ioport_map(dev, port, nr) ioport_map((port), (nr))
 #endif