CONFIG_CPU_MIPS32 is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

CONFIG_CPU_MIPS32 (not configurable)

configname: CONFIG_CPU_MIPS32

Linux Kernel Configuration
└─>CPU_MIPS32
In linux kernel since version 2.6.12  
is depended by
CONFIG_CPU_BMIPS
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