treewide: remove pkgs_i686

This was getting evaluated eagerly causing assertion failures in
aarch64 systems. We can replace usages of pkgs_i686 with
pkgs.pkgsi686Linux.

nixos/modules/virtualisation/parallels-guest.nix

@@ -1,4 +1,4 @@
-{ config, lib, pkgs, pkgs_i686, ... }:
+{ config, lib, pkgs, ... }:
 
 with lib;
 
@@ -64,7 +64,7 @@ in
     };
 
     hardware.opengl.package = prl-tools;
-    hardware.opengl.package32 = pkgs_i686.linuxPackages.prl-tools.override { libsOnly = true; kernel = null; };
+    hardware.opengl.package32 = pkgs.pkgsi686Linux.linuxPackages.prl-tools.override { libsOnly = true; kernel = null; };
 
     services.udev.packages = [ prl-tools ];