arm64: dts: mediatek: mt8195-demo: Remove input-name property

This property doesn't seem to exist in the documentation nor
in source code, let's remove it from the device-tree.

Signed-off-by: Fabien Parent <fparent@baylibre.com>
Link: https://lore.kernel.org/r/20220426134106.242353-7-fparent@baylibre.com


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