thermal/drivers/qcom: Remove get_trend function

There is a get_trend function which is a wrapper to call a private
get_trend function. However, this private get_trend function is not
assigned anywhere.

Remove this dead code.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Amit Kucheria <amitk@kernel.org>
Link: https://lore.kernel.org/r/20220616202537.303655-1-daniel.lezcano@linaro.org


Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>