CONFIG_MACH_SMDKV210 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_MACH_SMDKV210.
Result is shown for kernelversion 6.5.1

SMDKV210

modulename: mach-smdkv210.ko

configname: CONFIG_MACH_SMDKV210

Linux Kernel Configuration
└─>S5PV210 Machines
└─>SMDKV210
In linux kernel since version 2.6.34 (release Date: 2010-05-16)  
Machine support for Samsung SMDKV210

source code:
arch/arm/mach-s5pv210/mach-smdkv210.c