Fix netutils-wrappers missing <transport/>

...the file could not be parsed by libvintf in O
because of a missing element. Add a dummy element
so that O libvintf is happy.

Fixes: 67653129
Bug: 64447338
Test: parse manifest.xml with O libvintf.
Change-Id: I38d8544f489c5ce4d5d8d901cd59be3e6434df61
diff --git a/manifest.xml b/manifest.xml
index f34bfb1..333fa36 100644
--- a/manifest.xml
+++ b/manifest.xml
@@ -102,5 +102,6 @@
             device compatibility matrix.
         -->
         <version>1.0</version>
+        <transport/>
     </hal>
 </manifest>