In ESXi 5.x

For hostd:
Backup and edit the following file, /etc/vmware/hostd/config.xml and add the below text:

   <level id="nfcsvc">  
        <logName> Nfc </logName>  
        <logLevel> trivia </logLevel>  
        <prefix> true </prefix>  
   </level>  

For vpxa:

Backup and edit the following file, etc/vmware/vpxa/vpxa.cfg and add/replace the below text:

   <nfc>  
        <loglevel>trivia</loglevel>  
   </nfc>