CONFIG_ARCH_SPEAR3XX is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

ST SPEAr3xx

modulename: spear3xx.ko

and/or

pl080.ko

and/or

spear-shirq.ko

and/or

spear3xx_clock.ko

configname: CONFIG_ARCH_SPEAR3XX

Linux Kernel Configuration
└─>ST SPEAr Family
└─>ST SPEAr3xx
In linux kernel since version 2.6.35 (release Date: 2010-08-01)  
Supports for ARM's SPEAR3XX family

source code:
arch/arm/mach-spear/spear3xx.c

depends
CONFIG_PLAT_SPEAR
NOT CONFIG_ARCH_SPEAR13XX
CONFIG_ARCH_MULTI_V5 or CONFIG_PLAT_SPEAR_SINGLE

is selected by
CONFIG_DEBUG_SPEAR3XX

is depended by
CONFIG_ARCH_SPEAR_AUTO