flashrom: use a udev uaccess tag instead of introducing a custom flashrom group

See https://wiki.archlinux.org/title/Udev#Allowing_regular_users_to_use_devices for more info about the uaccess tag. The udev-acl tag is a legacy implementation, we add it purely for backwards compatibility.

nixos/modules/programs/flashrom.nix

@@ -22,6 +22,5 @@ in
   config = mkIf cfg.enable {
     services.udev.packages = [ cfg.package ];
     environment.systemPackages = [ cfg.package ];
-    users.groups.flashrom = { };
   };
 }

pkgs/tools/misc/flashrom/default.nix

@@ -26,7 +26,7 @@ stdenv.mkDerivation rec {
 
   postPatch = ''
     substituteInPlace util/flashrom_udev.rules \
-      --replace "plugdev" "flashrom"
+      --replace 'GROUP="plugdev"' 'TAG+="uaccess", TAG+="udev-acl"'
   '';
 
   makeFlags = [ "PREFIX=$(out)" "libinstall" ]