CONFIG_ARCH_S32 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm64

NXP S32 SoC Family

configname: CONFIG_ARCH_S32

Linux Kernel Configuration
└─>Platform selection
└─>NXP SoC support
└─>NXP S32 SoC Family
In linux kernel since version 4.14.326 (release Date: 2023-09-23)  
This enables support for the NXP S32 family of processors.

depends
CONFIG_ARCH_NXP

is selected by
CONFIG_FEC