MLBEDSW-4870: Update to TensorFlow 2.7

Update the flatbuffers generated code to comply with TensorFlow 2.7

Signed-off-by: Rickard Bolin <rickard.bolin@arm.com>
Change-Id: Iff29b05a6e145245861329b4ff9fc9fbd968da53
diff --git a/ethosu/vela/operation.py b/ethosu/vela/operation.py
index 1707d31..277f2de 100644
--- a/ethosu/vela/operation.py
+++ b/ethosu/vela/operation.py
@@ -307,6 +307,11 @@
     HashtableSize = OperatorInfo()
     ReduceAll = OperatorInfo()
     Conv3DTranspose = OperatorInfo()
+    VarHandle = OperatorInfo()
+    ReadVariable = OperatorInfo()
+    AssignVariable = OperatorInfo()
+    BroadcastArgs = OperatorInfo()
+    RandomStandardNormal = OperatorInfo()
 
     @property
     def info(self):