MLBEDSW-4854: Update to TensorFlow 2.5

This commit updates the flatbuffers generated code
to comply with TensorFlow 2.5, as well as stripping
away some legacy code.

Signed-off-by: Dwight Lidman <dwight.lidman@arm.com>
Change-Id: I01fe47ec2bde6e78fdde21ee1bc0a71f560c53ae
diff --git a/ethosu/vela/tflite/DensifyOptions.py b/ethosu/vela/tflite/DensifyOptions.py
index 12cbfb2..067b871 100644
--- a/ethosu/vela/tflite/DensifyOptions.py
+++ b/ethosu/vela/tflite/DensifyOptions.py
@@ -14,6 +14,10 @@
         x.Init(buf, n + offset)
         return x
 
+    @classmethod
+    def DensifyOptionsBufferHasIdentifier(cls, buf, offset, size_prefixed=False):
+        return flatbuffers.util.BufferHasIdentifier(buf, offset, b"\x54\x46\x4C\x33", size_prefixed=size_prefixed)
+
     # DensifyOptions
     def Init(self, buf, pos):
         self._tab = flatbuffers.table.Table(buf, pos)