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/mainboard/supermicro/h8dmr/mptable.c b/src/mainboard/supermicro/h8dmr/mptable.c
index 11db23f..9ebcb87 100644
--- a/src/mainboard/supermicro/h8dmr/mptable.c
+++ b/src/mainboard/supermicro/h8dmr/mptable.c
@@ -59,7 +59,8 @@
                 if (dev) {
 			res = find_resource(dev, PCI_BASE_ADDRESS_1);
 			if (res) {
-				smp_write_ioapic(mc, apicid_mcp55, 0x11, res->base);
+				smp_write_ioapic(mc, apicid_mcp55, 0x11,
+						 res2mmio(res, 0, 0));
 			}
 
 			dword = 0x43c6c643;