arm64: dts: qcom: pmr735a: stop depending on thermal_zones label

Most of SoC device trees do not provide the thermal_zones label. Thus
stop depending on it and use the full path to the thermal zones nodes.

Fixes: 7a3544e5 ("arm64: dts: qcom: pmr735a: Add temp-alarm support")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220226205035.1826360-6-dmitry.baryshkov@linaro.org