CONFIG_MACH_SMDKC110 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

SMDKC110

modulename: mach-smdkc110.ko

configname: CONFIG_MACH_SMDKC110

Linux Kernel Configuration
└─>S5PC110 Machines
└─>SMDKC110
In linux kernel since version 2.6.34 (release Date: 2010-05-16)  
Machine support for Samsung SMDKC110
S5PC110(MCP) is one of package option of S5PV210

source code:
arch/arm/mach-s5pv210/mach-smdkc110.c