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/sr5650/ht.c b/src/southbridge/amd/sr5650/ht.c
index 737eed2..816800f 100644
--- a/src/southbridge/amd/sr5650/ht.c
+++ b/src/southbridge/amd/sr5650/ht.c
@@ -128,7 +128,7 @@
 	dword = pci_read_config32(dev, 0xFC) & 0xfffffff0;
 	/* TODO: On SR56x0/SP5100 board, the IOAPIC on SR56x0 is the
 	 * 2nd one. We need to check if it also is on your board. */
-	setup_ioapic(dword, 1);
+	setup_ioapic((void *)dword, 1);
 }
 
 static void pcie_init(struct device *dev)