Disable zero copy buffers in bpf.
Disable zero copy buffers in bpf.

This was a no-op before my changes (so this was never really enabled) and
now it is known to cause issues with tcpdump and hostapd.

Disable this until we fix all the raised issues.

Issue:              #5257

BlackstarGroup/pfsense,dennypage/pfsense,phil-davis/pfsense,ptorsten/pfsense,NewEraCracker/pfsense,pfsense/pfsense,NOYB/pfsense,BlackstarGroup/pfsense,dennypage/pfsense,phil-davis/pfsense,BlackstarGroup/pfsense,ch1c4um/pfsense,brunostein/pfsense,brunostein/pfsense,pfsense/pfsense,dennypage/pfsense,pfsense/pfsense,NewEraCracker/pfsense,jxmx/pfsense,jxmx/pfsense,NewEraCracker/pfsense,ch1c4um/pfsense,ch1c4um/pfsense,NewEraCracker/pfsense,ch1c4um/pfsense,dennypage/pfsense,NOYB/pfsense,brunostein/pfsense,ptorsten/pfsense,BlackstarGroup/pfsense,pfsense/pfsense,phil-davis/pfsense,jxmx/pfsense,phil-davis/pfsense,NOYB/pfsense,ptorsten/pfsense