[][kernel][mt7988][common][arm64: dts: mt7988: remove internal test code]

[Description]
Remove internal test code.

[Release-log]
N/A

Change-Id: Ieb8997c02950dfacf89609b0936ad52cb1125558
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6686903
Build: srv_hbgsm110
1 file changed