[] [auxadc: change auxadc clk on mt7981]

[Description]
Change auxadc clk on mt7981.
Remove default axuadc clk.

[Release-log]
N/A

Change-Id: I472e8db12de1ecb38095f6cd10de56500e95ffc1
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5336220
2 files changed