[][kernel][mt7988][eth][Add 10G WAN support to mt7988d base on dsa-10g-emmc DTS]

[Description]
Add 10G WAN support to mt7988d base on dsa-10g-emmc DTS.

This patch configure the WAN LAN ports as below.
  eth2: external 10G WAN
  eth1: internal 2.5G LAN
  lan0-lan3: internal switch 1G LAN

[Release-log]
N/A

Change-Id: I1eecf160d02c2cde4303741b082b0cc0fd72d3ab
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/8655178
3 files changed