kgpe: formatting

src/platform/kgpe/default.nix

@@ -33,9 +33,7 @@
     # insecure configurations? (63xx without microcode)
     microcode-blob = null;
 
-    coreboot = let
+    coreboot = final.lib.makeOverridable (prev.coreboot.override {
-    in
-      final.lib.makeOverridable (prev.coreboot.override {
       iasl = final.iasl_20180531;
       payload = "${final.kernel}/bzImage";
       fmap = ./custom.fmap;