stats: Add gate input to statistics collector

Signed-off-by: Alex Forencich <alex@alexforencich.com>

tb/stats/taxi_stats_collect/test_taxi_stats_collect.py

@@ -39,6 +39,8 @@ class TB(object):
         for k in range(len(dut.stat_inc)):
             dut.stat_inc[k].setimmediatevalue(0)
             dut.stat_valid[k].setimmediatevalue(0)
+
+        dut.gate.setimmediatevalue(1)
         dut.update.setimmediatevalue(0)
 
     def set_backpressure_generator(self, generator=None):

tb/stats/taxi_stats_collect/test_taxi_stats_collect.sv

@@ -42,6 +42,7 @@ taxi_axis_if #(
     .ID_W(STAT_ID_W)
 ) m_axis_stat();
 
+logic gate;
 logic update;
 
 taxi_stats_collect #(
@@ -68,6 +69,7 @@ uut (
     /*
      * Control inputs
      */
+    .gate(gate),
     .update(update)
 );