ARM: dts: exynos: correct TMU phandle in Odroid XU

TMU node uses 0 as thermal-sensor-cells, thus thermal zone referencing
it must not have an argument to phandle.  Since thermal-sensors property
is already defined in included exynosi5410.dtsi, drop it from
exynos5410-odroidxu.dts to fix the error and remoev redundancy.

Fixes: 88644b4c ("ARM: dts: exynos: Configure PWM, usb3503, PMIC and thermal on Odroid XU board")
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20230209105841.779596-4-krzysztof.kozlowski@linaro.org


Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>