x86: Change MMIO addr in readN(addr)/writeN(addr, val) to pointer

On x86, change the type of the address parameter in
read8()/read16/read32()/write8()/write16()/write32() to be a
pointer, instead of unsigned long.

Change-Id: Ic26dd8a72d82828b69be3c04944710681b7bd330
Signed-off-by: Kevin Paul Herbert <kph@meraki.net>
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-on: http://review.coreboot.org/7784
Tested-by: build bot (Jenkins)
diff --git a/src/southbridge/amd/pi/hudson/sm.c b/src/southbridge/amd/pi/hudson/sm.c
index d6ca215..bc6564d 100644
--- a/src/southbridge/amd/pi/hudson/sm.c
+++ b/src/southbridge/amd/pi/hudson/sm.c
@@ -82,7 +82,7 @@
 
 static void sm_init(device_t dev)
 {
-	setup_ioapic(IO_APIC_ADDR, CONFIG_MAX_CPUS);
+	setup_ioapic(VIO_APIC_VADDR, CONFIG_MAX_CPUS);
 }
 
 static int lsmbus_recv_byte(device_t dev)