Move files around...

- "kernel" and "repos.nix" --> "common/"
- "firmware/surface-go/ath10k" --> "surface-go/firmware/ath10k"
- Update where "kernel", "firmware/surface-go" and "repos.nix" can be found

microsoft/surface/common/kernel/linux-package.nix

@@ -0,0 +1,22 @@
+{ lib,
+  buildLinux,
+  callPackage,
+  linuxPackagesFor,
+}:
+
+let
+  inherit (lib) recurseIntoAttrs;
+
+in {
+  repos = callPackage ../repos.nix {};
+
+  linuxPackage =
+    { version,
+      modDirVersion ? version,
+      ...
+    } @ args:
+    let
+      buildLinux' = buildLinux (args // { inherit modDirVersion; });
+      linuxPackagesFor' = linuxPackagesFor buildLinux';
+    in recurseIntoAttrs linuxPackagesFor';
+}