media: dt-bindings: media: camss: Add qcom,msm8996-camss binding

Add bindings for qcom,msm8996-camss in order to support the camera
subsystem on MSM8996.

Signed-off-by: Robert Foss <robert.foss@linaro.org>
Reviewed-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>