[rpc-server] add virtio to the list of tty drivers

Change-Id: I3badf1aaaabc8066ee0ef1d1d6913a472fce7e81
diff --git a/zircon/system/core/devmgr/devhost/rpc-server.cpp b/zircon/system/core/devmgr/devhost/rpc-server.cpp
index 0708f07..2bdba5c 100644
--- a/zircon/system/core/devmgr/devhost/rpc-server.cpp
+++ b/zircon/system/core/devmgr/devhost/rpc-server.cpp
@@ -56,7 +56,8 @@
     // only a couple of special cases for now
     const char *libname = dev->driver->libname().c_str();
     if ((strcmp(libname, "/boot/driver/pty.so") == 0) ||
-        (strcmp(libname, "/boot/driver/console.so") == 0)) {
+        (strcmp(libname, "/boot/driver/console.so") == 0) ||
+        (strcmp(libname, "/boot/driver/virtio.so") == 0)) {
         return fuchsia_io_NodeInfoTag_tty;
     } else {
         return fuchsia_io_NodeInfoTag_device;