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

RALINK DMA support

modulename: ralink-gdma.ko

configname: CONFIG_DMA_RALINK

Linux Kernel Configuration
└─>Device Drivers
└─>Staging drivers
└─>DMA Engine support
└─>RALINK DMA support
In linux kernel since version 4.2 (release Date: 2015-08-30)  
source code:
drivers/staging/ralink-gdma/ralink-gdma.c