Add logd security buffer tag types and string write API.

int __android_log_bswrite(int32_t tag, const char *payload);

int __android_log_security_bwrite(int32_t tag, const void *payload, size_t len);

int __android_log_security_bswrite(int32_t tag, const char *payload);

#ifdef __cplusplus

}

    return write_to_log(LOG_ID_EVENTS, vec, 4);

}

/*

 * Like __android_log_security_bwrite, but used for writing strings to the

 * security log.

 */

int __android_log_security_bswrite(int32_t tag, const char *payload)

{

    struct iovec vec[4];

    char type = EVENT_TYPE_STRING;

    uint32_t len = strlen(payload);

    vec[0].iov_base = &tag;

    vec[0].iov_len = sizeof(tag);

    vec[1].iov_base = &type;

    vec[1].iov_len = sizeof(type);

    vec[2].iov_base = &len;

    vec[2].iov_len = sizeof(len);

    vec[3].iov_base = (void*)payload;

    vec[3].iov_len = len;

    return write_to_log(LOG_ID_SECURITY, vec, 4);

}