CONFIG_ARCH_LAYERSCAPE is not available for thedefaultarchitecture x86.
Result is shown for architecture arm64
ARMv8 based Freescale Layerscape SoC family
configname: CONFIG_ARCH_LAYERSCAPE
Linux Kernel Configuration
└─>Platform selection
└─>ARMv8 based Freescale Layerscape SoC family
In linux kernel since version 3.10 (release Date: 2013-06-30)
This enables support for the Freescale Layerscape SoC family.