misc: pvpanic: fix warning implicit declaration

When building and have fragment CONFIG_NO_IOPORT_MAP enabled then the
following warning:

../drivers/misc/pvpanic.c: In function ‘pvpanic_walk_resources’:
../drivers/misc/pvpanic.c:73:10: error: implicit declaration of
function ‘ioport_map’; did you mean ‘ioremap’?
[-Werror=implicit-function-declaration]
base = ioport_map(r.start, resource_size(&r));
^~~~~~~~~~

Since commmit 5d32a66541c4 ("PCI/ACPI: Allow ACPI to be built without
CONFIG_PCI set"), its now possible to have ACPI enabled without haveing
PCI enabled. However, the pvpanic driver depends on HAS_IOPORT_MAP or
HAVE_IOREMAP_PROT when ACPI is enabled. It was fine until
commit 725eba2928ad ("misc/pvpanic: add MMIO support") got added.
Rework so that we do a extra check ifdef CONFIG_HAS_IOPORT_MAP.

Fixes: 5d32a66541c4 ("PCI/ACPI: Allow ACPI to be built without CONFIG_PCI set")
Suggested-by: Arnd Bergmann <[e-mail]>
Signed-off-by: Anders Roxell <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/misc/pvpanic.c

···
 	struct resource r;
 
 	if (acpi_dev_resource_io(res, &r)) {
+#ifdef CONFIG_HAS_IOPORT_MAP
 		base = ioport_map(r.start, resource_size(&r));
 		return AE_OK;
+#else
+		return AE_ERROR;
+#endif
 	} else if (acpi_dev_resource_memory(res, &r)) {
 		base = ioremap(r.start, resource_size(&r));
 		return AE_OK;