!842 net: hns3: add support for Hisilicon ptp sync device

Merge Pull Request from: @svishen 
 
This pull Requests support hns3 driver provide ptp driver to get 1588 clock from ethernet.
But only the first PF on main chip can support this, so if getting ptp time from other chip, 
may have some bus latency. The PTP sync device use to eliminate the bus latency.

issue:
https://gitee.com/openeuler/kernel/issues/I78MGV 
 
Link:https://gitee.com/openeuler/kernel/pulls/842

 

Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>