soc: hisilicon: kunpeng_hccs: Fix the 'lane_mode' field name in port info structure...

soc: hisilicon: kunpeng_hccs: Fix the 'lane_mode' field name in port info structure to 'max_lane_num'

The lane mode of HCCS port is an information to user, and actually comes
from the maximum lane number. But it is good and easy for driver to use
the maximum lane number. So fix the 'lane_mode' field name in port info
structure to 'max_lane_num'.

Signed-off-by: Huisong Li <lihuisong@huawei.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>