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/board/sbc8349/pci.c b/board/sbc8349/pci.c
index 9022c55..ac5f30b 100644
--- a/board/sbc8349/pci.c
+++ b/board/sbc8349/pci.c
@@ -197,7 +197,7 @@
 		       CONFIG_PCI_SYS_MEM_BUS,
 		       CONFIG_PCI_SYS_MEM_PHYS,
 		       gd->ram_size,
-		       PCI_REGION_MEM | PCI_REGION_MEMORY);
+		       PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
 
 	hose->region_count = 4;
 
@@ -293,7 +293,7 @@
 		       CONFIG_PCI_SYS_MEM_BUS,
 		       CONFIG_PCI_SYS_MEM_PHYS,
 		       gd->ram_size,
-		       PCI_REGION_MEM | PCI_REGION_MEMORY);
+		       PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
 
 	hose->region_count = 4;