arm64: mediatek: Propagate chassis-type where possible

The chassis-type string identifies the form-factor of the system:
add this property to all device trees of devices for which the form
factor is known.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20230517101108.205654-1-angelogioacchino.delregno@collabora.com


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