default or selected kernelversion does not have config value CONFIG_CARMA_FPGA.
Result is shown for kernelversion 6.5.1

CARMA DATA-FPGA Access Driver

modulename: carma-fpga.ko

configname: CONFIG_CARMA_FPGA

Linux Kernel Configuration
└─>Device Drivers
└─>Misc devices
└─>CARMA DATA-FPGA Access Driver
In linux kernel since version 3 (release Date: 2011-07-21)  
Say Y here to include support for communicating with the data
processing FPGAs on the OVRO CARMA board.

source code:
drivers/misc//carma/carma-fpga.c