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>

arm64: dts: add dts nodes for MT6779

this adds initial MT6779 dts settings for board support,
including cpu, gic, timer, ccf, pinctrl, uart, sysirq...etc.

Signed-off-by: Hanks Chen <hanks.chen@mediatek.com>
Link: https://lore.kernel.org/r/1596115816-11758-3-git-send-email-hanks.chen@mediatek.com
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>