media: dt-bindings: media: camss: Add qcom,sc8280xp-camss binding

Add bindings for qcom,sc8280xp-camss in order to support the camera
subsystem for sc8280xp as found in the Lenovo x13s Laptop.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>