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/include/pci.h b/include/pci.h
index 072273b..35ff1e9 100644
--- a/include/pci.h
+++ b/include/pci.h
@@ -334,7 +334,7 @@
 #define PCI_REGION_TYPE		0x00000001
 #define PCI_REGION_PREFETCH	0x00000008	/* prefetchable PCI memory */
 
-#define PCI_REGION_MEMORY	0x00000100	/* System memory */
+#define PCI_REGION_SYS_MEMORY	0x00000100	/* System memory */
 #define PCI_REGION_RO		0x00000200	/* Read-only memory */
 
 extern __inline__ void pci_set_region(struct pci_region *reg,