CONFIG_ARCH_LOKI is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_ARCH_LOKI.
Result is shown for kernelversion 5.6.18

Marvell Loki (88RC8480)

configname: CONFIG_ARCH_LOKI

ARM system type
└─>Marvell Loki (88RC8480)
In linux kernel since version 2.6.27 (release Date: 2008-10-09)  
Support for the Marvell Loki (88RC8480) SoC.