[Review]: ML Layer

[ReinhardKeil]

The Alif examples currently use the same ML layer

https://github.com/Arm-Examples/SDS-Examples/blob/main/Alif/AppKit-E7_USB/algorithm/ML/ML.clayer.yml
https://github.com/Arm-Examples/SDS-Examples/blob/main/Alif/DevKit-E8_ETH/algorithm/ML/ML.clayer.yml

Review these layers with the following aspects:

• Does it make sense to have so many fixed components or is it better to leave some of the signal processing code as stand-alone C modules (that can be optimzed).
• How would be such a layer ported to Zephyr (this is a longer term process).