RUI I2C Initialization

RUI_RETURN_STATUS rui_i2c_init(RUI_I2C_ST *rui_i2c);

@brief	This API is used to init I2C.
@return	RUI_RETURN_STATUS
@param	RUI_I2C_ST *rui_i2c: initialize parameters struct.
@module	RAK811, RAK4200, RAK4400, RAK4600, and RAK5010.