mfd: mt6397-core: Add mfd_cell for mt6359-accdet

mfd: mt6397-core: Add mfd_cell for mt6359-accdet

Add an mfd_cell for mt6359-accdet and describe its IRQ resources to
allow the mt6359-accdet driver to probe.

Signed-off-by: Andrew Perepech <andrew.perepech@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Acked-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20250305-mt6359-accdet-dts-v4-2-e5ffa5ee9991@collabora.com
Signed-off-by: Lee Jones <lee@kernel.org>