microsoft/surface: remove rust entirely for 6.12 kernel

Author: 8bitbuddhist

microsoft/surface/common/kernel/6.12/patches.nix

@@ -12,6 +12,11 @@
     structuredExtraConfig = with kernel; {
       STAGING_MEDIA = yes;
 
+      # Disable Rust support due to conflict with 1.91 introduced in NixOS 25.11
+      RUST = lib.mkForce no;
+      RUST_IS_AVAILABLE = lib.mkForce no;
+      HAVE_RUST = lib.mkForce no;
+
       ##
       ## Surface Aggregator Module
       ##