arm64: dts: qcom: ipq6018: add thermal zones

Add thermal zones to make use of thermal sensors data. For CPU zone,
add cooling device that uses CPU frequency scaling.

Signed-off-by: Mantas Pucka <mantas@8devices.com>
Link: https://lore.kernel.org/r/1706173452-1017-4-git-send-email-mantas@8devices.com


Signed-off-by: Bjorn Andersson <andersson@kernel.org>