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

[Description]
Add 10G WAN support to mt7988d base on dsa-10g-spim-nand 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: I6b86bb2d7897888280e3c5f43f8b2b848013314d
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/8322593
3 files changed