mtd: physmap_of: Fix ROM support via OF

The "ROM" and unknown probe types within the obsolete "direct-mapped"
probe function used the nonexistent "mtd_rom" probe instead of the
intended "map_rom".

Signed-off-by: Aaron Sierra <asierra@xes-inc.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
diff --git a/drivers/mtd/maps/physmap_of.c b/drivers/mtd/maps/physmap_of.c
index 217c25d..63d82da 100644
--- a/drivers/mtd/maps/physmap_of.c
+++ b/drivers/mtd/maps/physmap_of.c
@@ -103,7 +103,7 @@
 		if (strcmp(of_probe, "ROM") != 0)
 			dev_warn(&dev->dev, "obsolete_probe: don't know probe "
 				 "type '%s', mapping as rom\n", of_probe);
-		return do_map_probe("mtd_rom", map);
+		return do_map_probe("map_rom", map);
 	}
 }