coreboot-payload-tianocore: remove CSM build flag

it doesn't work anyways

pkgs/coreboot-payload-tianocore/default.nix

@@ -1,4 +1,11 @@
-{ fetchFromGitHub, python2, stdenv, libuuid, bc, utillinux, nasm, iasl, seabios
+{ fetchFromGitHub
+, python2
+, stdenv
+, libuuid
+, bc
+, utillinux
+, nasm
+, iasl
 }:
 
 # we can not override the source in edk2, so we had to copy the entire thing
@@ -58,7 +65,7 @@ in stdenv.mkDerivation {
 
   buildPhase = ''
     runHook preBuild
-    build -a X64 -a IA32 -b RELEASE -t GCC5 -p CorebootPayloadPkg/CorebootPayloadPkgIa32X64.dsc -n $NIX_BUILD_CORES -D CSM_ENABLE
+    build -a X64 -a IA32 -b RELEASE -t GCC5 -p CorebootPayloadPkg/CorebootPayloadPkgIa32X64.dsc -n $NIX_BUILD_CORES
     runHook postBuild
   '';
 
@@ -68,11 +75,5 @@ in stdenv.mkDerivation {
     runHook postInstall
   '';
 
-  hardeningDisable = [ "format" "stackprotector" "pic" "fortify" ];
-
-  postPatch = ''
-    cp ${seabios}/Csm16.bin OvmfPkg/Csm/Csm16/Csm16.bin
-  '';
-
   dontPatchELF = true;
 }