CONFIG_ARCH_LAYERSCAPE is not available for thedefaultarchitecture x86.
Result is shown for architecture arm64

Freescale Layerscape SoC family

configname: CONFIG_ARCH_LAYERSCAPE

Linux Kernel Configuration
└─>Platform selection
└─>NXP SoC support
└─>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.