default.nix: move flashrom into the ownerboot packageset

Since we (unfortunately) need to use different forks of flashrom for
different platforms, flashrom must be overrideable.  Moving it into
the ownerboot packageset is the way to do that.

src/default.nix

@@ -23,6 +23,7 @@ let
       kernel        = final.callPackage ./kernel { };
       userspace     = final.callPackage ./userspace { };
       initramfs     = final.callPackage ./initramfs { };
+      flashrom      = final.nixpkgsOnBuildForHost.callPackage ./util/flashrom { };
     };
   in
     (lib.makeScope
@@ -37,7 +38,6 @@ in {
   kgpe  = ownerboot (import ./platform/kgpe { inherit lib; });
 
   em100 = nixpkgsOnBuildForBuild.callPackage ./util/em100 { };
-  flashrom = nixpkgsOnBuildForBuild.callPackage ./util/flashrom { };
 }
 
 

src/platform/kevin/default.nix

@@ -103,9 +103,11 @@ in {
 
     ecfw-scripts = final.nixpkgsOnBuildForHost.callPackage (import ./ecfw/scripts.nix) {
       inherit (final) ectool ecfw;
-      flashrom-chromebook = final.nixpkgsOnBuildForHost.callPackage ../../util/flashrom { forChromebook = true; };
+      flashrom-chromebook = final.flashrom;
     };
 
+    flashrom = prev.flashrom.override { forChromebook = true; };
+
     ectool = final.nixpkgsOnBuildForHost.callPackage (import ../../util/ectool { boardName = "kevin"; }) { };
   })];
 }