CONFIG_MACH_MX25_3DS is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_MACH_MX25_3DS.
Result is shown for kernelversion 6.5.1

Support MX25PDK (3DS) Platform

modulename: mach-mx25_3ds.ko

configname: CONFIG_MACH_MX25_3DS

Linux Kernel Configuration
└─>Freescale i.MX support
└─>Support MX25PDK (3DS) Platform
In linux kernel since version 2.6.32 (release Date: 2009-12-02)  
source code:
arch/arm/mach-imx/mach-mx25_3ds.c