thermal/drivers/mediatek/lvts_thermal: Remove filtered mode for mt8188

Filtered mode is not supported on mt8188 SoC and is the source of bad
results. Move to immediate mode which provides good temperatures.

Fixes: f4745f54 ("thermal/drivers/mediatek/lvts_thermal: Add MT8188 support")
Reviewed-by: Nicolas Pitre <npitre@baylibre.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Julien Panis <jpanis@baylibre.com>
Link: https://lore.kernel.org/r/20240516-mtk-thermal-mt8188-mode-fix-v2-1-40a317442c62@baylibre.com


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