arm64: dts: mediatek: mt7986: drop invalid thermal block clock

Thermal block uses only two clocks. Its binding doesn't document or
allow "adc_32k". Also Linux driver doesn't support it.

It has been additionally verified by Angelo by his detailed research on
MT7981 / MT7986 clocks (thanks!).

This fixes:
arch/arm64/boot/dts/mediatek/mt7986a-bananapi-bpi-r3.dtb: thermal@1100c800: clocks: [[4, 27], [4, 44], [4, 45]] is too long
        from schema $id: http://devicetree.org/schemas/thermal/mediatek,thermal.yaml#
arch/arm64/boot/dts/mediatek/mt7986a-bananapi-bpi-r3.dtb: thermal@1100c800: clock-names: ['therm', 'auxadc', 'adc_32k'] is too long
        from schema $id: http://devicetree.org/schemas/thermal/mediatek,thermal.yaml#

Fixes: 0a9615d5 ("arm64: dts: mt7986: add thermal and efuse")
Cc: Daniel Golle <daniel@makrotopia.org>
Link: https://lore.kernel.org/linux-devicetree/17d143aa-576e-4d67-a0ea-b79f3518b81c@collabora.com/


Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20240213053739.14387-3-zajec5@gmail.com


Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>