net: hns3: Refactor mac mtu setting related functions

net: hns3: Refactor mac mtu setting related functions

BugLink: https://bugs.launchpad.net/bugs/1810457
This patch refactors mac mtu setting related functions,
normalizes the use of mps and mtu.

Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: Jian Shen <shenjian15@huawei.com>
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit e6d7d79d3ed6034f9b1ffc768fdff9257b6f7fd5)
Signed-off-by: dann frazier <dann.frazier@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>