[][kernel][mt7988][eth][phy: mediatek-ge: Remove I2MPB adjustment]

[Description]
Remove I2MPB adjustment, which is only for mt7981 now.

[Release-log]
N/A

Change-Id: I9a3e9f2f53d5615a57d76b7fe423cb99e590d596
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6954195
1 file changed