[][kernel][mt7981/mt7988][eth][phy: mediatek-ge: Add enhancement to slave mode and do calibration only once]

[Description]
Add enhancement to slave mode and do phy calibration only once at
system startup.

[Release-log]
N/A

Change-Id: Ic49d90fbb4c6524bd22984f5166496efd0247ca1
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6818459
1 file changed