CONFIG_X1000_CU1000_NEO is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

YSH & ATIL CU1000 Module with Neo backplane

configname: CONFIG_X1000_CU1000_NEO

Machine type
└─>YSH & ATIL CU1000 Module with Neo backplane
In linux kernel since version 5.1 (release Date: 2019-05-05)