dpdk: add ARMv8 sandboxed build support

DPDK defaults to reading machine info from /sys unless specific platform
info is provided at configure time. Tell it to build a generic version
instead of trying to optimize based on the build host.

pkgs/os-specific/linux/dpdk/default.nix

@@ -53,6 +53,7 @@ in stdenv.mkDerivation rec {
   ++ lib.optional (mod && kernel.kernelOlder "5.11") "-Ddisable_drivers=kni"
   ++ lib.optional (!shared) "-Ddefault_library=static"
   ++ lib.optional stdenv.isx86_64 "-Dmachine=nehalem"
+  ++ lib.optional stdenv.isAarch64 "-Dmachine=generic"
   ++ lib.optional mod "-Dkernel_dir=${placeholder "kmod"}/lib/modules/${kernel.modDirVersion}"
   ++ lib.optional (withExamples != []) "-Dexamples=${builtins.concatStringsSep "," withExamples}";