extract_utils: Remove super.raw after dumping partitions

This saves some space in case we want to keep the extracted content
via the KEEP_DUMP flag.

Change-Id: I0f5812853b5bff8b303a276047bb30d58690920d
diff --git a/extract_utils.sh b/extract_utils.sh
index 79562bd..0c37342 100644
--- a/extract_utils.sh
+++ b/extract_utils.sh
@@ -1592,6 +1592,7 @@
                 "$LPUNPACK" -p "$PARTITION" "$DUMPDIR"/super.raw "$DUMPDIR"
             fi
         done
+        rm "$DUMPDIR"/super.raw
 
         if [ "$KEEP_DUMP" == "true" ] || [ "$KEEP_DUMP" == "1" ]; then
             rm -rf "$KEEP_DUMP_DIR"/super_dump