CONFIG_MACH_ARMLEX4210 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_MACH_ARMLEX4210.
Result is shown for kernelversion 6.2.5

ARMLEX4210

modulename: mach-armlex4210.ko

configname: CONFIG_MACH_ARMLEX4210

Linux Kernel Configuration
└─>EXYNOS4 Machines
└─>ARMLEX4210
In linux kernel since version 2.6.39 (release Date: 2011-05-18)  
Machine support for Samsung ARMLEX4210 based on EXYNOS4210

source code: