Added Power Saving for NRF52 companions

examples/companion_radio/MyMesh.cpp

@@ -2222,3 +2222,11 @@ bool MyMesh::advert() {
     return false;
   }
 }
+
+// To check if there is pending work
+bool MyMesh::hasPendingWork() const {
+#if defined(WITH_BRIDGE)
+  if (bridge.isRunning()) return true; // bridge needs WiFi radio, can't sleep
+#endif
+  return _mgr->getOutboundTotal() > 0;
+}