Add per partition timestamp to 16K boot OTA

update_engine requiers per partition timestamp if this partition's build
prop includes build.date.utc.

Test: th
Bug: 293313353
Change-Id: I6bf3de8e855f0830b26bdbe2cbdc78ba891662a7
diff --git a/tools/releasetools/ota_from_raw_img.py b/tools/releasetools/ota_from_raw_img.py
index 63f88ea..0c1c05a 100644
--- a/tools/releasetools/ota_from_raw_img.py
+++ b/tools/releasetools/ota_from_raw_img.py
@@ -84,6 +84,7 @@
     cmd.append("--is_partial_update")
     if args.max_timestamp:
       cmd.append("--max_timestamp=" + str(args.max_timestamp))
+      cmd.append("--partition_timestamps=boot:" + str(args.max_timestamp))
     logger.info("Running %s", cmd)
 
     subprocess.check_call(cmd)