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/northbridge/intel/i945/rcven.c b/src/northbridge/intel/i945/rcven.c
index 88d6a00..6d429e4 100644
--- a/src/northbridge/intel/i945/rcven.c
+++ b/src/northbridge/intel/i945/rcven.c
@@ -42,8 +42,8 @@
 	}
 
 	for (i = 0; i < 28; i++) {
-		read32(addr);
-		read32(addr + 0x80);
+		read32((void *)addr);
+		read32((void *)(addr + 0x80));
 	}
 
 	reg32 = MCHBAR32(RCVENMT);