MLBEDSW-6710: Revert Tensorflow 2.9

Tensorflow 2.9 contains a bug for int16x8 without biases.

Revert "MLBEDSW-6635: Update to TensorFlow 2.9"

This reverts commit 93f492bae9c4dd16a1f64b851b237263695ee03e.

Signed-off-by: Johan Alfven <johan.alfven@arm.com>
Change-Id: I366d201ce4134a877d333be2aade546dfcb5d6d7
diff --git a/ethosu/vela/tflite/UnpackOptions.py b/ethosu/vela/tflite/UnpackOptions.py
index eed4019..b70b040 100644
--- a/ethosu/vela/tflite/UnpackOptions.py
+++ b/ethosu/vela/tflite/UnpackOptions.py
@@ -3,17 +3,27 @@
 # namespace: tflite
 
 import flatbuffers
+from flatbuffers.compat import import_numpy
+np = import_numpy()
 
 class UnpackOptions(object):
     __slots__ = ['_tab']
 
     @classmethod
-    def GetRootAsUnpackOptions(cls, buf, offset):
+    def GetRootAs(cls, buf, offset=0):
         n = flatbuffers.encode.Get(flatbuffers.packer.uoffset, buf, offset)
         x = UnpackOptions()
         x.Init(buf, n + offset)
         return x
 
+    @classmethod
+    def GetRootAsUnpackOptions(cls, buf, offset=0):
+        """This method is deprecated. Please switch to GetRootAs."""
+        return cls.GetRootAs(buf, offset)
+    @classmethod
+    def UnpackOptionsBufferHasIdentifier(cls, buf, offset, size_prefixed=False):
+        return flatbuffers.util.BufferHasIdentifier(buf, offset, b"\x54\x46\x4C\x33", size_prefixed=size_prefixed)
+
     # UnpackOptions
     def Init(self, buf, pos):
         self._tab = flatbuffers.table.Table(buf, pos)
@@ -32,7 +42,19 @@
             return self._tab.Get(flatbuffers.number_types.Int32Flags, o + self._tab.Pos)
         return 0
 
-def UnpackOptionsStart(builder): builder.StartObject(2)
-def UnpackOptionsAddNum(builder, num): builder.PrependInt32Slot(0, num, 0)
-def UnpackOptionsAddAxis(builder, axis): builder.PrependInt32Slot(1, axis, 0)
-def UnpackOptionsEnd(builder): return builder.EndObject()
+def Start(builder): builder.StartObject(2)
+def UnpackOptionsStart(builder):
+    """This method is deprecated. Please switch to Start."""
+    return Start(builder)
+def AddNum(builder, num): builder.PrependInt32Slot(0, num, 0)
+def UnpackOptionsAddNum(builder, num):
+    """This method is deprecated. Please switch to AddNum."""
+    return AddNum(builder, num)
+def AddAxis(builder, axis): builder.PrependInt32Slot(1, axis, 0)
+def UnpackOptionsAddAxis(builder, axis):
+    """This method is deprecated. Please switch to AddAxis."""
+    return AddAxis(builder, axis)
+def End(builder): return builder.EndObject()
+def UnpackOptionsEnd(builder):
+    """This method is deprecated. Please switch to End."""
+    return End(builder)
\ No newline at end of file