bml devices that are using rfs are automatically upgraded to ext4. Version 3.0.0.0.

Change-Id: I069f0c5122e8d48ce311f519f08890d3e569dbb3
diff --git a/common.h b/common.h
index 7d46cc0..a4acc39 100644
--- a/common.h
+++ b/common.h
@@ -112,6 +112,7 @@
     const char* device2;      // alternative device to try if fs_type
                               // == "ext4" or "vfat" and mounting
                               // 'device' fails
+    const char* fallback_fs_type;
 } Volume;
 
 #endif  // RECOVERY_COMMON_H