extract_utils: Support copying out to /vendor_dlkm.

Change-Id: I600c9d9eb8295e92da2016093462c6d658ca4062
diff --git a/build/tools/extract_utils.sh b/build/tools/extract_utils.sh
index 7c98b62..45ee096 100755
--- a/build/tools/extract_utils.sh
+++ b/build/tools/extract_utils.sh
@@ -316,6 +316,10 @@
             local OUTTARGET=$(truncate_file $TARGET)
             printf '    %s/proprietary/%s:$(TARGET_COPY_OUT_VENDOR)/%s%s\n' \
                 "$OUTDIR" "$TARGET" "$OUTTARGET" "$LINEEND" >> "$PRODUCTMK"
+        elif prefix_match_file "vendor_dlkm/" $TARGET ; then
+            local OUTTARGET=$(truncate_file $TARGET)
+            printf '    %s/proprietary/%s:$(TARGET_COPY_OUT_VENDOR_DLKM)/%s%s\n' \
+                "$OUTDIR" "$TARGET" "$OUTTARGET" "$LINEEND" >> "$PRODUCTMK"
         elif prefix_match_file "system/vendor/" $TARGET ; then
             local OUTTARGET=$(truncate_file $TARGET)
             printf '    %s/proprietary/%s:$(TARGET_COPY_OUT_VENDOR)/%s%s\n' \