net: ethernet: mediatek: Use hw_feature to judge if HWLRO is supported

Should hw_feature as hardware capability flags to check if hardware LRO
got support.

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