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/arch/x86/include/arch/io.h

@@ -16,7 +16,6 @@
 
 #include <endian.h>
 #include <stdint.h>
-#include <device/pci_type.h>
 
 /*
  * This file contains the definitions for the x86 IO instructions
@@ -203,6 +202,8 @@ static __always_inline void write64(volatile void *addr,
 }
 #endif
 
+typedef u32 pnp_devfn_t;
+
 #ifdef __SIMPLE_DEVICE__
 
 #define PNP_DEV(PORT, FUNC) (((PORT) << 8) | (FUNC))