board: developerbox: use identity mapping for >4GB

Identity-map the second and later memory banks which are located >4GB.

Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
diff --git a/board/socionext/developerbox/developerbox.c b/board/socionext/developerbox/developerbox.c
index f5a5fe0..e14bb7f 100644
--- a/board/socionext/developerbox/developerbox.c
+++ b/board/socionext/developerbox/developerbox.c
@@ -160,11 +160,11 @@
 		ri = DDR_REGION_INDEX(i);
 		mem_map[ri].phys = ent[i].base;
 		mem_map[ri].size = ent[i].size;
+		mem_map[ri].virt = mem_map[ri].phys;
 		if (i == 0)
 			continue;
 
 		mr = &mem_map[DDR_REGION_INDEX(0)];
-		mem_map[ri].virt = mr->virt + mr->size;
 		mem_map[ri].attrs = mr->attrs;
 	}