dt-bindings: thermal: samsung,exynos: specify cells

All Samsung Exynos SoCs Thermal Management Units have only one sensor,
so make '#thermal-sensor-cells' fixed at 0.

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240705-dt-bindings-thermal-allof-v1-1-554061b52fbc@linaro.org


Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>