CONFIG_AXS101 is not available for thedefaultarchitecture x86.
Result is shown for architecture arc

AXS101 with AXC001 CPU Card (ARC 770D/EM6/AS221)

configname: CONFIG_AXS101

Linux Kernel Configuration
└─>Synopsys ARC AXS10x Software Development Platforms
└─>AXS101 with AXC001 CPU Card (ARC 770D/EM6/AS221)
In linux kernel since version 4.1 (release Date: 2015-06-21)  
This adds support for the 770D/EM6/AS221 CPU Card. Only the ARC
770D is supported in Linux.

The AXS101 Platform consists of an AXS10x mainboard with
this daughtercard. Please use the axs101.dts device tree
with this configuration.