arm64: dts: qcom: fix thermal zones naming

Rename thermal zones according to dt-schema.
Fixes multiple `make dtbs_check` warnings about name convetion.

Signed-off-by: David Heidelberg <david@ixit.cz>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211214132750.69782-1-david@ixit.cz