CONFIG_ARCH_INTEL_SOCFPGA is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Altera SOCFPGA family

configname: CONFIG_ARCH_INTEL_SOCFPGA

Linux Kernel Configuration
└─>Altera SOCFPGA family
In linux kernel since version 4.14.326 (release Date: 2023-09-23)