[][kernel][common][eth][Fix a traffic stuck issue when changing the SGMII autoneg mode]

[Description]
Fix a traffic stuck issue when changing the SGMII autoneg mode.

Without this patch, the users may encounter a traffic stuck issue when
they change the SGMII autoneg mode using the ethtool.

[Release-log]
N/A


Change-Id: I5f3f9fe3716a81aa619ba1fefee27e972c8856c9
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/8260077
2 files changed