Fix merge_target_files in GRF case

aosp/2525591 remove SYSTEM/build.prop from vendor target_files,
and cause the same error reported in aosp/1836120.

Bug: 192422274
Change-Id: I3af33e44e395002a9cf26cf93677ff84c2c26207
diff --git a/tools/releasetools/merge/merge_target_files.py b/tools/releasetools/merge/merge_target_files.py
index ba2b14f..d8f7b15 100755
--- a/tools/releasetools/merge/merge_target_files.py
+++ b/tools/releasetools/merge/merge_target_files.py
@@ -165,17 +165,24 @@
     pass
 
 
-def include_meta_in_list(item_list):
-  """Include all `META/*` files in the item list.
+def include_extra_in_list(item_list):
+  """
+  1. Include all `META/*` files in the item list.
 
   To ensure that `AddImagesToTargetFiles` can still be used with vendor item
   list that do not specify all of the required META/ files, those files should
   be included by default. This preserves the backward compatibility of
   `rebuild_image_with_sepolicy`.
+
+  2. Include `SYSTEM/build.prop` file in the item list.
+
+  To ensure that `AddImagesToTargetFiles` for GRF vendor images, can still
+  access SYSTEM/build.prop to pass GetPartitionFingerprint check in BuildInfo
+  constructor.
   """
   if not item_list:
     return None
-  return list(item_list) + ['META/*']
+  return list(item_list) + ['META/*'] + ['SYSTEM/build.prop']
 
 
 def create_merged_package(temp_dir):
@@ -289,7 +296,7 @@
   merge_utils.CollectTargetFiles(
       input_zipfile_or_dir=OPTIONS.vendor_target_files,
       output_dir=vendor_target_files_dir,
-      item_list=include_meta_in_list(OPTIONS.vendor_item_list))
+      item_list=include_extra_in_list(OPTIONS.vendor_item_list))
 
   # Copy the partition contents from the merged target-files archive to the
   # vendor target-files archive.