CONFIG_CPU_FREQ_PXA is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_CPU_FREQ_PXA.
Result is shown for kernelversion 6.2.5

CONFIG_CPU_FREQ_PXA (not configurable)

configname: CONFIG_CPU_FREQ_PXA

Linux Kernel Configuration
└─>CPU Power Management
└─>CPU_FREQ_PXA
In linux kernel since version 2.6.25 (release Date: 2008-04-16)  
selects
CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE