Add vendor_dlkm partition.

Test: define vendor_dlkm for CF.
Bug: 156020364

Change-Id: I459059e1c20df7a285a377b8b3bbc8decc60b124
diff --git a/help.sh b/help.sh
index b02b14c..37018f7 100755
--- a/help.sh
+++ b/help.sh
@@ -43,7 +43,9 @@
     senod                   Quickly rebuild the system_ext image from built packages
                             Stands for "SystemExt, NO Dependencies"
     onod                    Quickly rebuild the odm image from built packages
-                            Stands for "ODM, NO Dependencies"
+                            Stands for "Odm, NO Dependencies"
+    vdnod                   Quickly rebuild the vendor_dlkm image from built packages
+                            Stands for "VendorDlkm, NO Dependencies"
 
 
 So, for example, you could run: