arm64: dts: msm8916: thermal: Convert camera trip type to hot

We don't have any cooling-devices related to the camera. Use the "hot"
trip type so allow the temperature to be exported to userspace and
remove the "critical" trip.

Signed-off-by: Amit Kucheria <amit.kucheria@linaro.org>
Signed-off-by: Andy Gross <agross@kernel.org>