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/StridedSliceOptions.py b/ethosu/vela/tflite/StridedSliceOptions.py
index 3bbb36b..c6cb790 100644
--- a/ethosu/vela/tflite/StridedSliceOptions.py
+++ b/ethosu/vela/tflite/StridedSliceOptions.py
@@ -3,6 +3,8 @@
 # namespace: tflite
 
 import flatbuffers
+from flatbuffers.compat import import_numpy
+np = import_numpy()
 
 class StridedSliceOptions(object):
     __slots__ = ['_tab']
@@ -14,6 +16,10 @@
         x.Init(buf, n + offset)
         return x
 
+    @classmethod
+    def StridedSliceOptionsBufferHasIdentifier(cls, buf, offset, size_prefixed=False):
+        return flatbuffers.util.BufferHasIdentifier(buf, offset, b"\x54\x46\x4C\x33", size_prefixed=size_prefixed)
+
     # StridedSliceOptions
     def Init(self, buf, pos):
         self._tab = flatbuffers.table.Table(buf, pos)