policer: add thread handoff for device input

Add worker thread handoff for policers on the device input feature arc
on an interface.

Type: improvement
Signed-off-by: Brian Russell <brian@graphiant.com>
Change-Id: Ib795457a09a5b3be3c4e6422c91e33100192b8e2
diff --git a/src/vnet/policer/policer.c b/src/vnet/policer/policer.c
index 678e588..4aaf9e0 100644
--- a/src/vnet/policer/policer.c
+++ b/src/vnet/policer/policer.c
@@ -628,6 +628,7 @@
   pm->vlib_main = vm;
   pm->vnet_main = vnet_get_main ();
   pm->log_class = vlib_log_register_class ("policer", 0);
+  pm->fq_index = vlib_frame_queue_main_init (policer_input_node.index, 0);
 
   pm->policer_config_by_name = hash_create_string (0, sizeof (uword));
   pm->policer_index_by_name = hash_create_string (0, sizeof (uword));