[][kernel][mt7986][eth][Rollback external PHY0 DTS configuratoin]

[Description]
Rollback external PHY0 DTS configuratoin.

If without this patch, Switch(SGMII0) will link down when LAN5 does not link up 2.5G.

[Release-log]
N/A

Change-Id: Ief87c73c7e39a592475294e8a81946b85c7844c3
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6396148
11 files changed