CONFIG_AXS103 is not available for thedefaultarchitecture x86.
Result is shown for architecture arc

AXS103 with AXC003 CPU Card (ARC HS38x)

configname: CONFIG_AXS103

Linux Kernel Configuration
└─>Synopsys ARC AXS10x Software Development Platforms
└─>AXS103 with AXC003 CPU Card (ARC HS38x)
In linux kernel since version 4.1 (release Date: 2015-06-21)  
This adds support for the HS38x CPU Card.

The AXS103 Platform consists of an AXS10x mainboard with
this daughtercard. Please use the axs103.dts device tree
with this configuration.