You've probably already figured this out but I'm just adding this because I had the same issue. If you just comment out the stanza for [unix-all-logs] in / /etc/app/unix/default/eventtypes.conf, you don't get any eventtypes for device syslogs. Or look at the stanza for [unix-all-logs] and remove the search parameters that would hit your device syslog files.
In unix app 4.5, I modified as follows:
OLD:
[nix-all-logs]
search = source=".log" OR source=".log." OR source="/log/" OR source="/var/adm/" OR source="access*" OR source="error" OR sourcetype="syslo*" NOT source=usersWithLoginPrivs NOT sourcetype=lastlog
NEW:
[nix-all-logs]
search = source="/var/adm/" OR source="access" OR source="error" NOT source=usersWithLoginPrivs NOT sourcetype=lastlog
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