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

PXA2xx-based

modulename: pxa_timer.ko

configname: CONFIG_ARCH_PXA

ARM system type
└─>PXA2xx-based
In linux kernel since version 2.6.12  
Support for Intel's PXA2XX processor line.


depends
 or CONFIG_MMU