Update Face HIDL enroll method

     * @param timeoutSec A timeout in seconds, after which this enrollment

     *     attempt is cancelled. Note that the client still needs to

     *     call postEnroll() to terminate the enrollment session.

     * @param requireAttention When set to true, requires user attention (e.g.

     *     eyes open and looking at the device) for enrollment to complete, as

     *     well as subsequent authentication. This is expected to be enabled by

     *     default to improve security and decrease falsing (unintentional face

     *     detection). This feature can be disabled at the user's request

     *     during enrollment, e.g. for accessibility reasons. When enabled,

     *     the FaceAcquiredInfo#POOR_GAZE message must be sent when the user's

     *     attention has not been established. The UI should inform the user

     *     to look at the device.

     * @return status The status of this method call.

     */

    @callflow(next={"cancel", "enroll", "postEnroll", "remove"})

    enroll(vec<uint8_t> hat, uint32_t timeoutSec) generates (Status status);

    enroll(vec<uint8_t> hat, uint32_t timeoutSec, bool requireAttention)

        generates (Status status);

    /**

     * Finishes the enrollment session and invalidates the challenge generated