CONFIG_ISA_DMA is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_ISA_DMA (not configurable)

modulename: dma-isa.ko

configname: CONFIG_ISA_DMA

Linux Kernel Configuration
└─>Bus support
└─>ISA_DMA
In linux kernel since version 2.6.12  
source code:
arch/arm/kernel/dma-isa.c