arm64: dts: mediatek: mt8188: add lvts definitions

Various values extracted from the vendor's kernel driver.

Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
Link: https://lore.kernel.org/r/20240402032729.2736685-14-nico@fluxnic.net


[Angelo: Fixed wrong nvmem-cell-names]
Signed-off-by: Julien Panis <jpanis@baylibre.com>
Link: https://lore.kernel.org/r/20240603-mtk-thermal-mt818x-dtsi-v7-5-8c8e3c7a3643@baylibre.com


Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>