set initial svn=1

Bug:112336626

Change-Id: Ia269c6b58fdd4be5ace756af925365b893a3c9cd
diff --git a/device.mk b/device.mk
index 3aef8bf..d108332 100644
--- a/device.mk
+++ b/device.mk
@@ -792,3 +792,7 @@
 # Do not skip init trigger by default
 PRODUCT_DEFAULT_PROPERTY_OVERRIDES += \
     vendor.skip.init=0
+
+# Increment the SVN for any official public releases
+PRODUCT_PROPERTY_OVERRIDES += \
+    ro.vendor.build.svn=1