uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/applications/virtualization/crosvm/generate-cargo.sh

@@ -0,0 +1,7 @@
+dir="$(mktemp -d)" &&
+    cd "$dir" &&
+    unpackPhase &&
+    cd "${sourceRoot:-}" &&
+    cargo generate-lockfile &&
+    mv Cargo.lock "$1"
+rm -rf "$dir"