arm64: dts: mediatek: mt8195-cherry-dojo: Describe M.2 M-key NVMe slot

arm64: dts: mediatek: mt8195-cherry-dojo: Describe M.2 M-key NVMe slot

The Dojo device has a M.2 M-key slot for an included NVMe on some
models.

Add a proper device tree description based on the new M.2 M-key binding.
Power for the slot is controlled by the embedded controller. As far as
the main SoC is concerned, it is always on.

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>