Set `result` field based on `seresult` and `apparmor` for AVC messages. An SELinux AVC event will set `seresult=denied`. An AppArmor AVC event will set `apparmor=<result>` where result can be one of [several values](https://github.com/linux-audit/audit-kernel/blob/v4.13/security/apparmor/include/audit.h#L37-L46).