pci: Rename PCI_REGION_MEMORY to PCI_REGION_SYS_MEMORY for clarity

The PCI_REGION_MEMORY and PCI_REGION_MEM are a bit to similar and
can be confusing when reading the code.

Rename PCI_REGION_MEMORY to PCI_REGION_SYS_MEMORY to clarify its used
for system memory mapping purposes.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/drivers/pci/tsi108_pci.c b/drivers/pci/tsi108_pci.c
index d153fc6..627e8a0 100644
--- a/drivers/pci/tsi108_pci.c
+++ b/drivers/pci/tsi108_pci.c
@@ -131,7 +131,7 @@
 	pci_set_region (hose->regions + 0,
 		       CONFIG_SYS_PCI_MEMORY_BUS,
 		       CONFIG_SYS_PCI_MEMORY_PHYS,
-		       CONFIG_SYS_PCI_MEMORY_SIZE, PCI_REGION_MEM | PCI_REGION_MEMORY);
+		       CONFIG_SYS_PCI_MEMORY_SIZE, PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
 
 	/* PCI memory space */
 	pci_set_region (hose->regions + 1,