Fix maven build

Change-Id: I71374cf697c79fe6809c687ca353e709fd087ae2
diff --git a/protocols/pom.xml b/protocols/pom.xml
index 0d133ac..512c294 100644
--- a/protocols/pom.xml
+++ b/protocols/pom.xml
@@ -44,6 +44,7 @@
         <module>restconf</module>
         <module>tl1</module>
         <module>grpc</module>
+        <module>p4runtime</module>
     </modules>
 
     <dependencies>