Combine the creation of ro and rw partition in one service file

- Use the combine ubimount service file that creates both
  rw and ro partition.

Change-Id: I40438bc16ac4f5734a749b7bf218ea5c6f628339
Signed-off-by: Saqib Khan <khansa@us.ibm.com>
diff --git a/item_updater.cpp b/item_updater.cpp
index 6df57ac..101bc00 100644
--- a/item_updater.cpp
+++ b/item_updater.cpp
@@ -344,7 +344,7 @@
     // Remove priority persistence file
     removeFile(entryId);
 
-    // Removing partitions
+    // Removing read-only and read-write partitions
     removeReadWritePartition(entryId);
     removeReadOnlyPartition(entryId);