CONFIG_FPU is not available for thedefaultarchitecture x86.
Result is shown for architecture riscv

FPU support

modulename: fpu.ko

configname: CONFIG_FPU

Linux Kernel Configuration
└─>Platform type
└─>FPU support
In linux kernel since version 2.6.12  
Say N here if you want to disable all floating-point related procedure
in the kernel.

If you don't know what to do here, say Y.