Increment version to 0.25

Also insert the TOSA file identifier in the flatbuffer.

Reports a warning if the identifier is not present when loading.

Signed-off-by: Eric Kunze <eric.kunze@arm.com>
Change-Id: I1cd4a9cc78e898ba5015e29be1c65cb640dd6a00
diff --git a/python/serializer/tosa_serializer.py b/python/serializer/tosa_serializer.py
index cd86777..929aebd 100644
--- a/python/serializer/tosa_serializer.py
+++ b/python/serializer/tosa_serializer.py
@@ -39,6 +39,10 @@
     TOSA_VERSION_PATCH,
     TOSA_VERSION_DRAFT,
 ]
+
+# File identifier needs to be kept in sync with schema/tosa.fbs
+TOSA_GRAPH_IDENTIFIER = b"\x54\x4F\x53\x41"
+
 # With the way flatc generates its python types, there is no programatic way
 # to get string names for the integer types.  Manually maintain a string table
 # here.
@@ -703,7 +707,7 @@
         TosaGraph.AddBlocks(builder, fbv_bb)
         graph = TosaGraph.End(builder)
 
-        self.builder.Finish(graph)
+        self.builder.Finish(graph, TOSA_GRAPH_IDENTIFIER)
         return self.builder.Output()
 
     def writeJson(self, tosa_filename):