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/pcippc2/cpc710_pci.c b/board/pcippc2/cpc710_pci.c
index bed8aea..ccd18e1 100644
--- a/board/pcippc2/cpc710_pci.c
+++ b/board/pcippc2/cpc710_pci.c
@@ -215,7 +215,7 @@
 		 PCI_MEMORY_BUS,
 		 PCI_MEMORY_PHYS,
 		 PCI_MEMORY_MAXSIZE,
-		 PCI_REGION_MEM | PCI_REGION_MEMORY);
+		 PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
 
   /* PCI memory space */
   pci_set_region(local_hose.regions + 1,
@@ -265,7 +265,7 @@
 		 PCI_MEMORY_BUS,
 		 PCI_MEMORY_PHYS,
 		 PCI_MEMORY_MAXSIZE,
-		 PCI_REGION_MEMORY);
+		 PCI_REGION_SYS_MEMORY);
 
   /* PCI memory space */
   pci_set_region(cpci_hose.regions + 1,