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/build-support/kernel/modules-closure.sh

@@ -0,0 +1,101 @@
+source $stdenv/setup
+
+# When no modules are built, the $out/lib/modules directory will not
+# exist. Because the rest of the script assumes it does exist, we
+# handle this special case first.
+if ! test -d "$kernel/lib/modules"; then
+    if test -z "$rootModules" || test -n "$allowMissing"; then
+        mkdir -p "$out"
+        exit 0
+    else
+        echo "Required modules: $rootModules"
+        echo "Can not derive a closure of kernel modules because no modules were provided."
+        exit 1
+    fi
+fi
+
+version=$(cd $kernel/lib/modules && ls -d *)
+
+echo "kernel version is $version"
+
+# Determine the dependencies of each root module.
+mkdir -p $out/lib/modules/"$version"
+touch closure
+for module in $rootModules; do
+    echo "root module: $module"
+    modprobe --config no-config -d $kernel --set-version "$version" --show-depends "$module" \
+    | while read cmd module args; do
+        case "$cmd" in
+            builtin)
+                touch found
+                echo "$module" >>closure
+                echo "  builtin dependency: $module";;
+            insmod)
+                touch found
+                if ! test -e "$module"; then
+                    echo "  dependency not found: $module"
+                    exit 1
+                fi
+                target=$(echo "$module" | sed "s^$NIX_STORE.*/lib/modules/^$out/lib/modules/^")
+                if test -e "$target"; then
+                    echo "  dependency already copied: $module"
+                    continue
+                fi
+                echo "$module" >>closure
+                echo "  copying dependency: $module"
+                mkdir -p $(dirname $target)
+                cp "$module" "$target"
+                # If the kernel is compiled with coverage instrumentation, it
+                # contains the paths of the *.gcda coverage data output files
+                # (which it doesn't actually use...).  Get rid of them to prevent
+                # the whole kernel from being included in the initrd.
+                nuke-refs "$target"
+                echo "$target" >> $out/insmod-list;;
+             *)
+                echo "  unexpected modprobe output: $cmd $module"
+                exit 1;;
+        esac
+    done || test -n "$allowMissing"
+    if ! test -e found; then
+        echo "  not found"
+        if test -z "$allowMissing"; then
+            exit 1
+        fi
+    else
+        rm found
+    fi
+done
+
+mkdir -p $out/lib/firmware
+for module in $(cat closure); do
+    # for builtin modules, modinfo will reply with a wrong output looking like:
+    #   $ modinfo -F firmware unix
+    #   name:           unix
+    #
+    # There is a pending attempt to fix this:
+    #   https://github.com/NixOS/nixpkgs/pull/96153
+    #   https://lore.kernel.org/linux-modules/20200823215433.j5gc5rnsmahpf43v@blumerang/T/#u
+    #
+    # For now, the workaround is just to filter out the extraneous lines out
+    # of its output.
+    for i in $(modinfo -b $kernel --set-version "$version" -F firmware $module | grep -v '^name:'); do
+        mkdir -p "$out/lib/firmware/$(dirname "$i")"
+        echo "firmware for $module: $i"
+        for name in "$i" "$i.xz" ""; do
+            [ -z "$name" ] && echo "WARNING: missing firmware $i for module $module"
+            if cp "$firmware/lib/firmware/$name" "$out/lib/firmware/$name" 2>/dev/null; then
+                break
+            fi
+        done
+    done
+done
+
+# copy module ordering hints for depmod
+cp $kernel/lib/modules/"$version"/modules.order $out/lib/modules/"$version"/.
+cp $kernel/lib/modules/"$version"/modules.builtin $out/lib/modules/"$version"/.
+
+depmod -b $out -a $version
+
+# remove original hints from final derivation
+rm $out/lib/modules/"$version"/modules.order
+rm $out/lib/modules/"$version"/modules.builtin