stm32/eth: add set_poll_interval

examples/stm32h5/src/bin/eth.rs

@@ -76,7 +76,7 @@ async fn main(spawner: Spawner) -> ! {
         p.PG13,
         p.PB15,
         p.PG11,
-        GenericSMI::new(Duration::from_millis(500)),
+        GenericSMI::new(),
         mac_addr,
         0,
     );