linux/kernel: Remove KVM_APIC_ARCHITECTURE for 4.8

The option is no longer needed and has been removed upstream in
torvalds/linux@557abc40d121358883d2da8bc8bf976d6e8ec332.

Signed-off-by: aszlig <[e-mail]>

pkgs/os-specific/linux/kernel/common-config.nix

···
   PARAVIRT? y
   HYPERVISOR_GUEST y
   PARAVIRT_SPINLOCKS? y
-  KVM_APIC_ARCHITECTURE y
+  ${optionalString (versionOlder version "4.8") ''
+    KVM_APIC_ARCHITECTURE y
+  ''}
   KVM_ASYNC_PF y
   ${optionalString (versionAtLeast version "4.0") ''
     KVM_COMPAT? y