dt-bindings: i2c: Add binding for Qualcomm CCI I2C controller

Add DT binding document for Qualcomm Camera Control Interface (CCI)
I2C controller.

Signed-off-by: Todor Tomov <todor.tomov@linaro.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>