net-next: mediatek: cleanup unnecessary get chip id and its user

Since driver is devicetree-based, all device type and charateristic can be
determined by the compatible string and its data. It's unnecessary to
create another dependent function to check chip ID and then decide whether
the specific funciton is being supported on a certain device. It can be
totally replaced by the existing flag, so a cleanup is made by removing
the function and the only user, HWLRO.

MT2701 also have a missing HWLRO support in old code, so add it the same
patch.

Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mediatek/mtk_eth_soc.h

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.h b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
index 672b8c3..4681929 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
@@ -566,6 +566,7 @@ struct mtk_rx_ring {
 #define MTK_GMAC2_SGMII			(BIT(10) | MTK_SGMII)
 #define MTK_DUAL_GMAC_SHARED_SGMII	(BIT(11) | MTK_GMAC1_SGMII | \
 					 MTK_GMAC2_SGMII)
+#define MTK_HWLRO			BIT(12)
 #define MTK_HAS_CAPS(caps, _x)		(((caps) & (_x)) == (_x))
 
 /* struct mtk_eth_data -	This is the structure holding all differences
@@ -635,7 +636,6 @@ struct mtk_eth {
 	struct regmap			*ethsys;
 	struct regmap			*sgmiisys;
 	struct regmap			*pctl;
-	u32				chip_id;
 	bool				hwlro;
 	refcount_t			dma_refcnt;
 	struct mtk_tx_ring		tx_ring;