axi_dmac: data_mover: Improve timing

The pending_burst signal and the expression id != request_id are almost
identical. pending_burst goes high with a delay of one clock cycle, but the
important thing is that it goes low on the same clock cycle as the expression.
By using pending_burst here instead of 'id != request_id' we can reduce the
fanout of the 'id' register and improve the timing of the core.

library/axi_dmac/data_mover.v

@@ -152,7 +152,7 @@ end
 always @(*)
 begin
 	if ((s_axi_ready && s_axi_valid && last) ||
-		(sync_id && id != request_id))
+		(sync_id && pending_burst))
 		id_next <= inc_id(id);
 	else
 		id_next <= id;