[][MT7981 enable debug clk]

[Description]
Add debug clk for mt7981.

[Release-log]
N/A

Change-Id: I91c4b8d2d78a0dffa24b0e63cdcd873986b5e7f6
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5334223
2 files changed