stellio: drop mt7530 get_stats64 kernel patch, in 6.18.58

Upstream 07d9958739 was backported to linux-6.18.y as af98611ad109
(2026-10-15) and is in the 6.18.58 nixpkgs now builds for stellio.
Applying the patch on top fails: patch(1) rejects all 10 hunks as
already applied, so the kernel build has been broken since the nixpkgs
bump brought 6.18.58.

machines/stellio/configuration.nix

@@ -44,20 +44,6 @@
     };
     systemd.coredump.enable = false;
 
-    # Upstream 07d9958739 (mainline 2026-05, not in linux-6.18.y). The MT7531
-    # switch on the Flint 2 hangs off MDIO, and mt7530_get_stats64 took the
-    # MDIO mutex under the RCU read lock that /proc/net/dev holds, so any
-    # stats reader (zerotier-one, node exporter, `ip -s link`) that raced a
-    # PHY access oopsed the box: "BUG: scheduling while atomic" ->
-    # "Unable to handle kernel paging request" on 2026-09-20 09:02 UTC.
-    # Drop once boot.kernelPackages moves to a kernel that carries it.
-    boot.kernelPatches = [
-      {
-        name = "mt7530-get-stats64-atomic";
-        patch = ./mt7530-get-stats64-atomic.patch;
-      }
-    ];
-
     # nixpkgs' services.blocky check runs the aarch64 blocky in a
     # system.checks derivation, which an x86_64 builder without binfmt cannot
     # execute (`--max-jobs 0` -> Exec format error). Validate the same YAML