Add vendor_dlkm partition (2nd attempt)

Certain vendor kernel modules were previously stored in the vendor
partition. With this change, we create a new separate partition named
vendor_dlkm for these vendor modules.

Bug: 173653839
Change-Id: I1fc887bdfac958d3a65fb48a4bf7a398e756733e
diff --git a/BoardConfig-common.mk b/BoardConfig-common.mk
index 6a95618..57fa101 100644
--- a/BoardConfig-common.mk
+++ b/BoardConfig-common.mk
@@ -180,7 +180,8 @@
     system \
     system_ext \
     product \
-    vendor
+    vendor \
+    vendor_dlkm
 
 # Set error limit to BOARD_SUPER_PARTITON_SIZE - 500MB
 BOARD_SUPER_PARTITION_ERROR_LIMIT := 8006926336