thermal/drivers/qcom-spmi-temp-alarm: Drop unused driver data

thermal/drivers/qcom-spmi-temp-alarm: Drop unused driver data

The platform device driver data has not been used since commit
7a4ca51b7040 ("thermal/drivers/qcom-spmi: Use devm_iio_channel_get") so
drop the unnecessary assignment.

Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20250228082936.5694-1-johan+linaro@kernel.org
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>