arch/io.h: Fix PCI and PNP simple typedefs

Provide clean separation for PCI and PNP headers,
followup will also move PNP outside <arch/io.h>.

Change-Id: I85db254d50f18ea34a5e95bc517eac4085a5fafa
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/31690
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

src/northbridge/amd/amdfam10/pci.h

@@ -18,6 +18,7 @@
 
 #include <inttypes.h>
 #include <arch/io.h>
+#include <device/pci_type.h>
 #include <device/pci_def.h>
 
 u32 pci_read_config32_index(pci_devfn_t dev, u32 index_reg, u32 index);