Updating readme files with trademark information.

Change-Id: Id5313510777b771231f42701faff1da93765deda

Implement a weak linked function to handle the data cache.
If the specific device is implementing a data cache the function should
be overriden with device specific implementation of the flush/invalidate
functions to make sure that the cache is properly maintained with
regards to the NPU DMA transaction.

Change-Id: I175644ef37bee62cc77d789d2b7bc3073e72ea5a

Change-Id: Id96dd7824352992c07b5fa3ce8a39a84926557a8

Add information how to contribute and how to report security incidents.

Change-Id: I7946e66b30c4e338ffa5a279b5d769a764c34f0f

Change-Id: I3cdf8f21ed58ace2f2c739748d788ec97fb4083a