Old Kconfig name for Kernel automounter support

configname: CONFIG_AUTOFS4_FS

Linux Kernel Configuration
└─>File systems
└─>Old Kconfig name for Kernel automounter support
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
This name exists for people to just automatically pick up the
new name of the autofs Kconfig option. All it does is select
the new option name.

It will go away in a release or two as people have
transitioned to just plain AUTOFS_FS.