arch/x86: Drop arch/pciconf.h

It's unused, so get rid of it.

Change-Id: I28c6dc0208686edc3aabaf624773ea70350c1c8f
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: https://review.coreboot.org/13177
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/arch/x86/pci_ops_conf1.c

@@ -13,7 +13,6 @@
 
 #include <console/console.h>
 #include <arch/io.h>
-#include <arch/pciconf.h>
 #include <device/pci.h>
 #include <device/pci_ids.h>
 #include <device/pci_ops.h>