ravb: remove unhandle int cause

This driver does not handle the AVB-DMAC Receive FIFO Warning interrupt
now, so the interrupt should not be enabled.
Signed-off-by: NMasaru Nagai <masaru.nagai.vx@renesas.com>
Signed-off-by: NYoshihiro Kaneko <ykaneko0929@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/renesas/ravb_main.c

@@ -408,8 +408,6 @@ static int ravb_dmac_init(struct net_device *ndev)
 	/* Interrupt enable: */
 	/* Frame receive */
 	ravb_write(ndev, RIC0_FRE0 | RIC0_FRE1, RIC0);
-	/* Receive FIFO full warning */
-	ravb_write(ndev, RIC1_RFWE, RIC1);
 	/* Receive FIFO full error, descriptor empty */
 	ravb_write(ndev, RIC2_QFE0 | RIC2_QFE1 | RIC2_RFFE, RIC2);
 	/* Frame transmitted, timestamp FIFO updated */