CONFIG_ARCH_KEEMBAY is not available for thedefaultarchitecture x86.
Result is shown for architecture arm64

Keem Bay SoC

configname: CONFIG_ARCH_KEEMBAY

Linux Kernel Configuration
└─>Platform selection
└─>Keem Bay SoC
In linux kernel since version 4.14.326 (release Date: 2023-09-23)  
This enables support for Intel Movidius SoC code-named Keem Bay.