net-next: mediatek: fix compile error inside mtk_poll_controller()

commit 8067302 ("net-next: mediatek: add support for IRQ grouping")
failed to properly update the irq handling inside mtk_poll_controller()
causing compile errors if netconsole was enabled. Fix this by updating
the code to use the new separated irq handler function for RX.

Signed-off-by: John Crispin <john@phrozen.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mediatek/mtk_eth_soc.c

@@ -1297,7 +1297,7 @@ static void mtk_poll_controller(struct net_device *dev)
 	u32 int_mask = MTK_TX_DONE_INT | MTK_RX_DONE_INT;
 
 	mtk_irq_disable(eth, int_mask);
-	mtk_handle_irq(dev->irq[0], dev);
+	mtk_handle_irq_rx(eth->irq[2], dev);
 	mtk_irq_enable(eth, int_mask);
 }
 #endif