ARM: dts: sun8i-h3: Drop args in 'thermal-sensors'

The "allwinner,sun8i-h3-ths" thermal sensor has 0 argument cells, but
the consumer has an argument cell. It is ignored by the code, but the
error was found with some upcoming schema validation changes. The schema
and code both agree that 0 cells is correct.

Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220204002802.1214602-1-robh@kernel.org