CONFIG_LANTIQ_MACH_EASY50712 is not available for thedefaultarchitecture x86.
Result is shown for architecture mips
default or selected kernelversion does not have config value CONFIG_LANTIQ_MACH_EASY50712.
Result is shown for kernelversion 6.2.5

Easy50712 - Danube

modulename: mach-easy50712.ko

configname: CONFIG_LANTIQ_MACH_EASY50712

Linux Kernel Configuration
└─>MIPS Machine
└─>Easy50712 - Danube
In linux kernel since version 3 (release Date: 2011-07-21)  
source code:
arch/mips/lantiq/xway/mach-easy50712.c
depends
CONFIG_SOC_XWAY