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 93f492ba.

Signed-off-by: Johan Alfven <johan.alfven@arm.com>
Change-Id: I366d201ce4134a877d333be2aade546dfcb5d6d7