CONFIG_ARCH_SPEAR_AUTO is not available for the selected architecture x86.
Result is shown for architecture arm

CONFIG_ARCH_SPEAR_AUTO (not configurable)

configname: CONFIG_ARCH_SPEAR_AUTO

Linux Kernel Configuration
└─>ST SPEAr Family
└─>ARCH_SPEAR_AUTO
In linux kernel since version 3.1 (release Date: 2011-10-24)