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/agesa/hudson/spi.c b/src/southbridge/amd/agesa/hudson/spi.c
index 735ab7e..fe6ea50 100644
--- a/src/southbridge/amd/agesa/hudson/spi.c
+++ b/src/southbridge/amd/agesa/hudson/spi.c
@@ -53,12 +53,12 @@
 
 static inline uint8_t spi_read(uint8_t reg)
 {
-	return read8(spibar + reg);
+	return read8((void *)(spibar + reg));
 }
 
 static inline void spi_write(uint8_t reg, uint8_t val)
 {
-	write8(spibar + reg, val);
+	write8((void *)(spibar + reg), val);
 }
 
 static void reset_internal_fifo_pointer(void)