[][Kernel][mt7988][eth][Add Ethernet clock config]

[Description]
Add Ethernet clock configurations which is suggested by
clock owner - Xiufeng.

If without this patch, some Ethernet/WED functions won't
work after removing mt7988-clkitg.dtsi.

[Release-log]
N/A


Change-Id: I835888ed0d6408d2dd7eb2c704ecc0d3c6f076a8
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6988778
4 files changed