media: dt-bindings: media: qcom,camss: Add bindings for SDM660 camss

Add bindings for qcom,sdm660-camss in order to support the camera
subsystem on SDM630/660 and SDA variants.

Signed-off-by: AngeloGioacchino Del Regno <kholk11@gmail.com>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>