CONFIG_SH_DMA is not available for thedefaultarchitecture x86.
Result is shown for architecture sh

SuperH on-chip DMA controller (DMAC) support

configname: CONFIG_SH_DMA

Linux Kernel Configuration
└─>DMA support
└─>SuperH on-chip DMA controller (DMAC) support
In linux kernel since version 2.6.12  

is selected by
CONFIG_SH_DMAE_BASE