Added support for building verified vendor partition

Change-Id: I762724800ccab3a365e6d2efdf86cd9c394818eb
Signed-off-by: Daniel Rosenberg <drosen@google.com>
diff --git a/tools/releasetools/common.py b/tools/releasetools/common.py
index 701a9cb..f2f35f4 100644
--- a/tools/releasetools/common.py
+++ b/tools/releasetools/common.py
@@ -153,6 +153,7 @@
   makeint("recovery_api_version")
   makeint("blocksize")
   makeint("system_size")
+  makeint("vendor_size")
   makeint("userdata_size")
   makeint("cache_size")
   makeint("recovery_size")