hub: Increase elastic buffer size

If the input and output clock enables are exactly aligned, the elastic
buffer can overflow (as it waits for 2 entries before offering, and
there's a cycle of latency). Increase the size so we don't run into that
situation.

Fixes: b351beb ("Add hub")
Signed-off-by: Sean Anderson <seanga2@gmail.com>

rtl/hub.v

@@ -28,7 +28,7 @@ module hub (
 
 	parameter WISHBONE		= 1;
 	parameter PORT_COUNT		= 4;
-	parameter ELASTIC_BUF_SIZE	= 3;
+	parameter ELASTIC_BUF_SIZE	= 5;
 	parameter ENABLE_COUNTERS	= 1;
 	parameter COUNTER_WIDTH		= 15;
 	parameter [23:0] OUI		= 0;