default or selected kernelversion does not have config value CONFIG_SND_SST_MFLD_PLATFORM.
Result is shown for kernelversion 6.4.14

CONFIG_SND_SST_MFLD_PLATFORM (not configurable)

modulename: snd-soc-sst-mfld-platform.ko

configname: CONFIG_SND_SST_MFLD_PLATFORM

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
└─>Advanced Linux Sound Architecture
└─>ALSA for SoC audio support
└─>SND_SST_MFLD_PLATFORM
In linux kernel since version 3.15 (release Date: 2014-06-08)  
source code: