default or selected kernelversion does not have config value CONFIG_MMC_ATMELMCI_DMA.
Result is shown for kernelversion 6.2.5

Atmel MCI DMA support

configname: CONFIG_MMC_ATMELMCI_DMA

Linux Kernel Configuration
└─>Device Drivers
└─>MMC/SD/SDIO card support
└─>Atmel MCI DMA support
In linux kernel since version 2.6.28 (release Date: 2008-12-24)  
Say Y here to have the Atmel MCI driver use a DMA engine to
do data transfers and thus increase the throughput and
reduce the CPU utilization.

If unsure, say N.