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This commit sets the correct value to the MCU_CTRL bit for the cc2538_rf. This variable is used to detect when the radio is doing transmission with CCA. Since this was not set to 1 when sending without CCA, the `confirm_transmit` function returned -EAGAIN after the TX_DONE event (which violates the HAL API). This error was discovered using some Radio HAL riotctrl scripts by @LarsKowoll.