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/cpu/mpc83xx/pci.c b/cpu/mpc83xx/pci.c
index e9965d7..5fe8964 100644
--- a/cpu/mpc83xx/pci.c
+++ b/cpu/mpc83xx/pci.c
@@ -89,7 +89,7 @@
 	hose->regions[i].bus_start = 0;
 	hose->regions[i].phys_start = 0;
 	hose->regions[i].size = gd->ram_size;
-	hose->regions[i].flags = PCI_REGION_MEM | PCI_REGION_MEMORY;
+	hose->regions[i].flags = PCI_REGION_MEM | PCI_REGION_SYS_MEMORY;
 
 	hose->first_busno = 0;
 	hose->last_busno = 0xff;