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/soc/intel/baytrail/sata.c b/src/soc/intel/baytrail/sata.c
index 28a2f8c..bed57c7 100644
--- a/src/soc/intel/baytrail/sata.c
+++ b/src/soc/intel/baytrail/sata.c
@@ -92,7 +92,7 @@
 	pci_write_config16(dev, 0x92, reg16);
 
 	if (config->sata_ahci) {
-		u32 abar = pci_read_config32(dev, PCI_BASE_ADDRESS_5);
+	  u8 *abar = (u8 *)pci_read_config32(dev, PCI_BASE_ADDRESS_5);
 
 		/* Enable CR memory space decoding */
 		reg16 = pci_read_config16(dev, 0x04);