CONFIG_KVM_ARM_VGIC is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_KVM_ARM_VGIC.
Result is shown for kernelversion 6.5.1

KVM support for Virtual GIC

configname: CONFIG_KVM_ARM_VGIC

Linux Kernel Configuration
└─>Virtualization
└─>KVM support for Virtual GIC
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Adds support for a hardware assisted, in-kernel GIC emulation.