src: Move {pci,pnp}_devfn_t to common 'device/pci_type.h'

Definitions of these types are arch-agnostic. Shared device
subsystem files cannot include arch/pci_ops.h for ARM
and arch/io.h for x86.

Change-Id: I6a3deea676308e2dc703b5e06558b05235191044
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/29947
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

src/arch/arm/include/arch/pci_ops.h

@@ -17,8 +17,7 @@
 #define ARCH_ARM_PCI_OPS_H
 
 #include <stdint.h>
-
-typedef u32 pci_devfn_t;
+#include <device/pci_type.h>
 
 #ifdef __SIMPLE_DEVICE__
 u8 pci_read_config8(pci_devfn_t dev, unsigned int where);