net: hns3: unify the pause params setup function

Since the firmware cmd to setup mac pause params is the same as the
firmware cmd to pfc pause params, this patch unifies the pause params
setup function.

Signed-off-by: Fuyun Liang <liangfuyun1@huawei.com>
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>