CONFIG_VFP is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

VFP-format floating point maths

configname: CONFIG_VFP

Linux Kernel Configuration
└─>Floating point emulation
└─>VFP-format floating point maths
In linux kernel since version 2.6.12  
Say Y to include VFP support code in the kernel. This is needed
if your hardware includes a VFP unit.

Please see Documentation/arm/VFP/release-notes.txt for
release notes and additional status information.

Say N if your target does not have VFP hardware.