[][kernel][common][thermal][Remove unused cooling device node in dts]

[Description]
Remove unused passive cooling device node in dts, b/c device will switch
to state 0 automatically while the temp is under 85000.

[Release-log]
N/A

Change-Id: If04d5be12915a4530f162911f5653f2df4ae9c4f
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/8482469
2 files changed