arm64: dts: uniphier: Rename pvtctl node to thermal-sensor

The pvtctl node belongs to thermal-sensor, so the node name should be
renamed to thermal-sensor.

Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Link: https://lore.kernel.org/r/20220913042321.4817-2-hayashi.kunihiko@socionext.com

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Signed-off-by: Arnd Bergmann <arnd@arndb.de>