arm64: dts: mediatek: mt8183-pumpkin: fix bad thermistor node name

Fix the following dtbs_check error by using the correct node name:
/home/fabo/build/linux/mt8183-pumpkin/arch/arm64/boot/dts/mediatek/mt8183-pumpkin.dtb: ntc: $nodename:0: 'ntc' does not match '^thermistor(.*)?$'
	From schema: /home/fabo/devel/baylibre/linux-mainline/Documentation/devicetree/bindings/hwmon/ntc-thermistor.yaml

Signed-off-by: Fabien Parent <fparent@baylibre.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Link: https://lore.kernel.org/r/20220426164755.435372-1-fparent@baylibre.com


Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>