Revert "net: mediatek: remove set but not used variable 'status'"

This reverts commit ee641b0c.

Actually it is not clear whether this register read is not
needed for it's HW side effects or not.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/mediatek/mtk_eth_soc.c

@@ -1948,7 +1948,9 @@ static irqreturn_t mtk_handle_irq_tx(int irq, void *_eth)
 static irqreturn_t mtk_handle_irq(int irq, void *_eth)
 {
 	struct mtk_eth *eth = _eth;
+	u32 status;
 
+	status = mtk_r32(eth, MTK_PDMA_INT_STATUS);
 	if (mtk_r32(eth, MTK_PDMA_INT_MASK) & MTK_RX_DONE_INT) {
 		if (mtk_r32(eth, MTK_PDMA_INT_STATUS) & MTK_RX_DONE_INT)
 			mtk_handle_irq_rx(irq, _eth);