Add odm_dlkm partition.

Test: define odm_dlkm in CF.
Bug: 156020364
Change-Id: I5593d09a1cdf13e651a13e951336555a7475865e

tools/releasetools/merge_target_files.py

@@ -198,6 +198,7 @@ DEFAULT_VENDOR_ITEM_LIST = (
     'RADIO/*',
     'VENDOR/*',
     'VENDOR_DLKM/*',
+    'ODM_DLKM/*',
 )
 
 # VENDOR_EXTRACT_SPECIAL_ITEM_LIST is a list of items to extract from the
@@ -225,6 +226,7 @@ SINGLE_BUILD_PARTITIONS = (
     'SYSTEM_OTHER/',
     'VENDOR/',
     'VENDOR_DLKM/',
+    'ODM_DLKM/',
 )