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

Intel DBPXA250 Development Platform (aka Lubbock)

modulename: lubbock.ko

configname: CONFIG_ARCH_LUBBOCK

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


is selected by
CONFIG_PCMCIA_PXA2XX