[][dts: mt7986: Remove 2nd layer dtsi]

[Description]
Remove 2nd layer dtsi

[Release-log]
N/A

Change-Id: I76964aa893fda74bd1d3d1967ca7e39de9df0985
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5053658
2 files changed