CONFIG_CPU_HAS_VDSP is not available for thedefaultarchitecture x86.
Result is shown for architecture csky

CPU has VDSP coprocessor

configname: CONFIG_CPU_HAS_VDSP

Linux Kernel Configuration
└─>Processor type and features
└─>CPU has VDSP coprocessor
In linux kernel since version 4.2 (release Date: 2015-08-30)