Add vendor_dlkm partition.

Test: define vendor_dlkm for CF.
Bug: 156020364

Change-Id: I459059e1c20df7a285a377b8b3bbc8decc60b124
diff --git a/tools/releasetools/ota_from_target_files.py b/tools/releasetools/ota_from_target_files.py
index 7fb0a77..f114f63 100755
--- a/tools/releasetools/ota_from_target_files.py
+++ b/tools/releasetools/ota_from_target_files.py
@@ -277,7 +277,8 @@
 UNZIP_PATTERN = ['IMAGES/*', 'META/*', 'OTA/*', 'RADIO/*']
 # Files to be unzipped for target diffing purpose.
 TARGET_DIFFING_UNZIP_PATTERN = ['BOOT', 'RECOVERY', 'SYSTEM/*', 'VENDOR/*',
-                                'PRODUCT/*', 'SYSTEM_EXT/*', 'ODM/*']
+                                'PRODUCT/*', 'SYSTEM_EXT/*', 'ODM/*',
+                                'VENDOR_DLKM/*']
 RETROFIT_DAP_UNZIP_PATTERN = ['OTA/super_*.img', AB_PARTITIONS]
 
 # Images to be excluded from secondary payload. We essentially only keep
@@ -285,7 +286,7 @@
 SECONDARY_PAYLOAD_SKIPPED_IMAGES = [
     'boot', 'dtbo', 'modem', 'odm', 'product', 'radio', 'recovery',
     'system_ext', 'vbmeta', 'vbmeta_system', 'vbmeta_vendor', 'vendor',
-    'vendor_boot']
+    'vendor_boot', 'vendor_dlkm']
 
 
 class PayloadSigner(object):
@@ -668,7 +669,8 @@
     assert blockimgdiff_version >= 3
 
   block_diff_dict = collections.OrderedDict()
-  partition_names = ["system", "vendor", "product", "odm", "system_ext"]
+  partition_names = ["system", "vendor", "product", "odm", "system_ext",
+                     "vendor_dlkm"]
   for partition in partition_names:
     if not HasPartition(target_zip, partition):
       continue