Display per-partition timestamp in payload_info.py am: f2e7ee5a3d am: 6e0e984ef4

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/1399748

Change-Id: Ibdf3ecdf998ae605b3af5135c1603efcc70902b4
diff --git a/scripts/payload_info.py b/scripts/payload_info.py
index 965bb76..7625ee8 100755
--- a/scripts/payload_info.py
+++ b/scripts/payload_info.py
@@ -74,7 +74,9 @@
     for partition in manifest.partitions:
       DisplayValue('  Number of "%s" ops' % partition.partition_name,
                    len(partition.operations))
-
+    for partition in manifest.partitions:
+      DisplayValue("Timestamp for " +
+                   partition.partition_name, partition.version)
     DisplayValue('Block size', manifest.block_size)
     DisplayValue('Minor version', manifest.minor_version)