media: dt-bindings: qcom,sdm660-camss: document interconnects

Document the interconnect properties used in the Qualcomm CAMSS on
SDM660:

  sdm630-sony-xperia-nile-discovery.dtb: camss@ca00000: 'interconnect-names', 'interconnects' do not match any of the regexes: 'pinctrl-[0-9]+'

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@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@kernel.org>