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/MAI/AmigaOneG3SE/articiaS_pci.c b/board/MAI/AmigaOneG3SE/articiaS_pci.c
index 45b8195..371f67f 100644
--- a/board/MAI/AmigaOneG3SE/articiaS_pci.c
+++ b/board/MAI/AmigaOneG3SE/articiaS_pci.c
@@ -313,7 +313,7 @@
 		   ARTICIAS_SYS_BUS,
 		   ARTICIAS_SYS_PHYS,
 		   ARTICIAS_SYS_MAXSIZE,
-		   PCI_REGION_MEM | PCI_REGION_MEMORY);
+		   PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
 
     /* PCI memory space */
     pci_set_region(articiaS_hose.regions + 1,