dt-bindings: arm: amlogic: add Vero 4K+ bindings

Add the board binding for the OSMC Vero 4K+ STB device

Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://lore.kernel.org/r/20220211105311.30320-3-christianshewitt@gmail.com