We should check register PHY_STATE when getting the bitmap of a
wideport, as, if the PHY is not ready, the value of register
PHY_PORT_NUM_MA is not valid.

V2 hw has done this check, and v3 hw should do this check too.
Signed-off-by: NXiaofei Tan <tanxiaofei@huawei.com>
Signed-off-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>