media: qcom: camss: add support for SDM670 camss

The camera subsystem for the SDM670 the same as on SDM845 except with
3 CSIPHY ports instead of 4. Add support for the SDM670 camera
subsystem.

Signed-off-by: Richard Acayan <mailingradian@gmail.com>
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>