intel PCI ops: Remove explicit PCI MMCONF access

MMCONF was explicitly used here to avoid races of 0xcf8/0xcfc access
being non-atomic and/or need to access 4kiB of PCI config space.

All these platforms now have MMCONF_SUPPORT_DEFAULT.

Change-Id: If62537475eb67b7ecf85f2292a2a954a41bc18d1
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/17545
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/southbridge/intel/ibexpeak/me.c

@@ -32,7 +32,7 @@
 #include <elog.h>
 
 #ifdef __SMM__
-#include <arch/pci_mmio_cfg.h>
+#include <arch/io.h>
 #else
 # include <device/device.h>
 # include <device/pci.h>