build_image.py recognize BOARD_PRODUCTIMAGE_PARTITION_RESERVED_SIZE

Test: builds
Bug: 79106666
Change-Id: I26aba694fd3d6a2feed7601524dde52569ba41e2
diff --git a/tools/releasetools/build_image.py b/tools/releasetools/build_image.py
index d0c9d09..f536afb 100755
--- a/tools/releasetools/build_image.py
+++ b/tools/releasetools/build_image.py
@@ -875,6 +875,7 @@
     copy_prop("product_extfs_inode_count", "extfs_inode_count")
     if not copy_prop("product_extfs_rsv_pct", "extfs_rsv_pct"):
       d["extfs_rsv_pct"] = "0"
+    copy_prop("product_reserved_size", "partition_reserved_size")
   elif mount_point == "product-services":
     copy_prop("avb_productservices_hashtree_enable", "avb_hashtree_enable")
     copy_prop("avb_productservices_add_hashtree_footer_args",
@@ -935,6 +936,8 @@
     copy_prop("partition_size", "system_size")
   elif mount_point == "vendor":
     copy_prop("partition_size", "vendor_size")
+  elif mount_point == "product":
+    copy_prop("partition_size", "product_size")
   return d