CONFIG_ARCH_PICOXCELL is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Picochip picoXcell

configname: CONFIG_ARCH_PICOXCELL

ARM system type
└─>Picochip picoXcell
In linux kernel since version 3.1 (release Date: 2011-10-24)  
This enables support for systems based on the Picochip picoXcell
family of Femtocell devices. The picoxcell support requires device tree
for all boards.