Merge "Update BLIND_SPOT_WARNING_ENABLED documentation in HAL"

     * Set true to enable BSW and false to disable BSW. When BSW is enabled, the ADAS system in the

     * vehicle should be turned on and monitoring for objects in the vehicle’s blind spots.

     *

     * If BSW is not available, IVehicle#get must not return any NOT_AVAILABLE value in StatusCode.

     * Other StatusCode values like TRY_AGAIN may still be used as needed. For example, if BSW is

     * not available because the vehicle speed is too low, IVehicle#get must return false.

     * In general, BLIND_SPOT_WARNING_ENABLED should always return true or false. If the feature is

     * not available due to some temporary state, such as the vehicle speed being too low, that

     * information must be conveyed through the ErrorState values in the BLIND_SPOT_WARNING_STATE

     * property.

     *

     * This property is defined as read_write, but OEMs have the option to implement it as read

     * only.