anbox: drop kernel modules package

All builds are broken:
- 4.14
- 4.19
- 5.4

https://hydra.nixos.org/eval/1761072?filter=anbox&compare=1760998&full=#tabs-still-fail

Let's just drop it.

This leaves the anbox module possibly in a broken-ish state,
but I'm not sure what to do about it.

nixos/modules/virtualisation/anbox.nix

@@ -73,9 +73,6 @@ in
 
     environment.systemPackages = with pkgs; [ anbox ];
 
-    boot.kernelModules = [ "ashmem_linux" "binder_linux" ];
-    boot.extraModulePackages = [ kernelPackages.anbox ];
-
     services.udev.extraRules = ''
       KERNEL=="ashmem", NAME="%k", MODE="0666"
       KERNEL=="binder*", NAME="%k", MODE="0666"

pkgs/os-specific/linux/anbox/kmod.nix

@@ -1,42 +0,0 @@
-{ lib, stdenv, kernel, fetchFromGitHub }:
-
-stdenv.mkDerivation {
-  pname = "anbox-modules";
-  version = "2020-06-14-${kernel.version}";
-
-  src = fetchFromGitHub {
-    owner = "anbox";
-    repo = "anbox-modules";
-    rev = "98f0f3b3b1eeb5a6954ca15ec43e150b76369086";
-    sha256 = "sha256-6xDJQ4YItdbYqle/9VNfOc7D80yFGd9cFyF+CuABaF0=";
-  };
-
-  nativeBuildInputs = kernel.moduleBuildDependencies;
-
-  KERNEL_SRC="${kernel.dev}/lib/modules/${kernel.modDirVersion}/build";
-
-  buildPhase = ''
-    for d in ashmem binder;do
-      cd $d
-      make
-      cd -
-    done
-  '';
-
-  installPhase = ''
-    modDir=$out/lib/modules/${kernel.modDirVersion}/kernel/updates/
-    mkdir -p $modDir
-    for d in ashmem binder;do
-      mv $d/$d*.ko $modDir/.
-    done
-  '';
-
-  meta = with lib; {
-    description = "Anbox ashmem and binder drivers.";
-    homepage = "https://github.com/anbox/anbox-modules";
-    license = licenses.gpl2Only;
-    platforms = platforms.linux;
-    broken = kernel.kernelAtLeast "5.5";
-    maintainers = with maintainers; [ edwtjo ];
-  };
-}

pkgs/top-level/linux-kernels.nix

@@ -271,8 +271,6 @@ in {
       });
     };
 
-    anbox = callPackage ../os-specific/linux/anbox/kmod.nix { };
-
     apfs = callPackage ../os-specific/linux/apfs { };
 
     batman_adv = callPackage ../os-specific/linux/batman-adv {};