How to use I2C Hub for RSB-4710

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Use i2cdetect cmd to detect iic devices (for example, i2cdetect -y 4).

rk3399_rsb4710:/ $ i2cdetect -l
i2c-0   unknown         rk3x-i2c                                I2C adapter
i2c-1   unknown         rk3x-i2c                                I2C adapter
i2c-4   unknown         rk3x-i2c                                I2C adapter
i2c-9   unknown         DesignWare HDMI                            I2C adapter

root@linaro-alip:~# i2cdetect -y 4

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