default or selected kernelversion does not have config value CONFIG_FMC_TRIVIAL.
Result is shown for kernelversion 6.9.9

FMC trivial mezzanine driver (software testing)

modulename: fmc-trivial.ko

configname: CONFIG_FMC_TRIVIAL

Linux Kernel Configuration
└─>Device Drivers
└─>FMC support
└─>FMC trivial mezzanine driver (software testing)
In linux kernel since version 3.11 (release Date: 2013-09-02)  
This is a fake mezzanine driver, to show how FMC works and test it.
The driver also handles interrupts (we used it with a real carrier
before the mezzanines were produced)

source code:
depends
CONFIG_FMC