[][kernel][mt7986][eth][Change single PHY driver for Maxlinear GPY211]

[Description]
Change single PHY driver for Maxlinear GPY211.

If without this patch, kernel can't get the link speed and dynamic switch link mode for HSGMII.

[Release-log]
N/A

Change-Id: I89b145873eba02726722a783bca37f59aa1ce1c8
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6547293
11 files changed