thermal/drivers/user_space: Sort headers alphabetically

Sort headers to make it easier to read and find duplicate headers.

Signed-off-by: Amit Kucheria <amit.kucheria@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/406d0c7c961e997b42e25adf4e432fe4f57b315a.1589199124.git.amit.kucheria@linaro.org