CONFIG_SBC8560 is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc
default or selected kernelversion does not have config value CONFIG_SBC8560.
Result is shown for kernelversion 6.2.5

Wind River SBC8560

modulename: sbc8560.ko

configname: CONFIG_SBC8560

Linux Kernel Configuration
└─>Freescale Book-E Machine Type
└─>Wind River SBC8560
In linux kernel since version 2.6.12  
This option enables support for the Wind River SBC8560 board

source code: