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

CONFIG_DMA_NONCOHERENT_CACHE_SYNC (not configurable)

configname: CONFIG_DMA_NONCOHERENT_CACHE_SYNC

Linux Kernel Configuration
└─>Library routines
└─>DMA_NONCOHERENT_CACHE_SYNC
In linux kernel since version 4.1 (release Date: 2015-06-21)