ad_tdd_control: Avoid unnecessary reset on control lines

No need to reset for tdd_last_burst, it's value depends on the tdd_burst_counter.

library/common/ad_tdd_control.v

@@ -310,10 +310,13 @@ module ad_tdd_control(
       end else begin
         tdd_burst_counter <= tdd_burst_count;
       end
-      tdd_last_burst <= (tdd_burst_counter == 6'b1) ? 1'b1 : 1'b0;
     end
   end
 
+  always @(posedge clk) begin
+    tdd_last_burst <= (tdd_burst_counter == 6'b1) ? 1'b1 : 1'b0;
+  end
+
   // ***************************************************************************
   // generate control signals
   // ***************************************************************************