eth: fix function name for new microkit version

Signed-off-by: Krishnan Winter <krishnanwinter1@gmail.com>

drivers/network/starfive/ethernet.c

@@ -441,7 +441,7 @@ void notified(microkit_channel ch)
     switch (ch) {
     case IRQ_CH:
         handle_irq();
-        microkit_irq_ack_delayed(ch);
+        microkit_deferred_irq_ack(ch);
         break;
     case RX_CH:
         rx_provide();