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

Intel DBPXA250 Development Platform

modulename: lubbock.ko

configname: CONFIG_ARCH_LUBBOCK

Linux Kernel Configuration
└─>Intel PXA2xx/PXA3xx Implementations
└─>Intel DBPXA250 Development Platform
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
source code:
arch/arm/mach-pxa/lubbock.c

depends
CONFIG_ARCH_PXA |
NOT | CONFIG_ARCH_PXA_V7

is selected by
CONFIG_PCMCIA_PXA2XX