net: hns3: add ioctl support for imp-controlled PHYs

When the imp-controlled PHYs feature is enabled, driver will not
register mdio bus. In order to support ioctl ops for phy tool to
read or write phy register in this case, the firmware implement
a new command for driver and driver implement ioctl by using this
new command.

Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>