CONFIG_CPU_FREQ_AT32AP is not available for thedefaultarchitecture x86.
Result is shown for architecture avr32
default or selected kernelversion does not have config value CONFIG_CPU_FREQ_AT32AP.
Result is shown for kernelversion 6.2.5

CPU frequency driver for AT32AP

modulename: cpufreq.ko

configname: CONFIG_CPU_FREQ_AT32AP

Linux Kernel Configuration
└─>Power management options
└─>CPU Frequency scaling
└─>CPU frequency driver for AT32AP
In linux kernel since version 2.6.23 (release Date: 2007-10-09)  
This enables the CPU frequency driver for AT32AP processors.

For details, take a look in Documentation/cpu-freq.

If in doubt, say N.

source code:
depends
CONFIG_CPU_FREQ
CONFIG_PLATFORM_AT32AP