[][mt7981: remove spi clk in bringup node]

[Description]
Remove spi clock default on

[Release-log]
N/A

Change-Id: Ia3d91f41a4b83970946bfaa0ce72e8160e394442
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5336984
1 file changed