soc: mediatek: mtk-svs: Use devm variant for dev_pm_opp_of_add_table()

In error cases, this driver never calls dev_pm_opp_of_remove_table():
instead of doing that, simple switch to a devm variant, which will
automagically do that for us.

Fixes: 681a02e9 ("soc: mediatek: SVS: introduce MTK SVS engine")
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220726141653.177948-6-angelogioacchino.delregno@collabora.com


Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>