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/common/fdt_support.c b/common/fdt_support.c
index a79bc08..b54f886 100644
--- a/common/fdt_support.c
+++ b/common/fdt_support.c
@@ -646,8 +646,8 @@
 	for (r = 0; r < hose->region_count; r++) {
 		u64 bus_start, phys_start, size;
 
-		/* skip if !PCI_REGION_MEMORY */
-		if (!(hose->regions[r].flags & PCI_REGION_MEMORY))
+		/* skip if !PCI_REGION_SYS_MEMORY */
+		if (!(hose->regions[r].flags & PCI_REGION_SYS_MEMORY))
 			continue;
 
 		bus_start = (u64)hose->regions[r].bus_start;