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The RTC I2C peripheral always expects a I2C slave sub register address to be programmed. If it is not programmed then a sub register address available in SENS_SAR_I2C_CTRL_REG[18:11] is used for I2C read/write. This commit updates the documentation of the API ulp_riscv_i2c_master_set_slave_reg_addr() to clarify the same.