dpdk: add ARMv8 sandboxed build support
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.

NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs