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/hudson.c b/src/southbridge/amd/pi/hudson/hudson.c
index e5382b4..5c55065 100644
--- a/src/southbridge/amd/pi/hudson/hudson.c
+++ b/src/southbridge/amd/pi/hudson/hudson.c
@@ -47,22 +47,22 @@
 
 void pm_write8(u8 reg, u8 value)
 {
-	write8(PM_MMIO_BASE + reg, value);
+	write8((void *)(PM_MMIO_BASE + reg), value);
 }
 
 u8 pm_read8(u8 reg)
 {
-	return read8(PM_MMIO_BASE + reg);
+	return read8((void *)(PM_MMIO_BASE + reg));
 }
 
 void pm_write16(u8 reg, u16 value)
 {
-	write16(PM_MMIO_BASE + reg, value);
+	write16((void *)(PM_MMIO_BASE + reg), value);
 }
 
 u16 pm_read16(u16 reg)
 {
-	return read16(PM_MMIO_BASE + reg);
+	return read16((void *)(PM_MMIO_BASE + reg));
 }
 
 void hudson_enable(device_t dev)