[ONOS-7137] Interfaces Discovery through gNMI

Also, bumped version of gNMI proto as supported by PI

Change-Id: If2903b2dc483f545893daae77f993cc7dadee468
diff --git a/drivers/bmv2/src/main/resources/bmv2-drivers.xml b/drivers/bmv2/src/main/resources/bmv2-drivers.xml
index 22bf067..0d6e0daa 100644
--- a/drivers/bmv2/src/main/resources/bmv2-drivers.xml
+++ b/drivers/bmv2/src/main/resources/bmv2-drivers.xml
@@ -15,7 +15,7 @@
   ~ limitations under the License.
   -->
 <drivers>
-    <driver name="bmv2" manufacturer="p4.org" hwVersion="master" swVersion="master" extends="p4runtime">
+    <driver name="bmv2" manufacturer="p4.org" hwVersion="master" swVersion="master" extends="p4runtime, gnmi">
         <behaviour api="org.onosproject.net.behaviour.PiPipelineProgrammable"
                    impl="org.onosproject.drivers.bmv2.Bmv2PipelineProgrammable"/>
     </driver>