Implement a remoteproc driver for controlling firmware loading and
powering up and down of the CPU on a Ethos-U subsystem.

Change-Id: I075d24c780b306aa8152c4a9e24a31df29574f9e

Adding documentation, component- and sequence diagrams how the driver
library and kernel driver work.

Change-Id: I4e71b5e1f5d926386efe8f103a0f4fbc8636a494

Updating readme files with trademark information. Adding missing license
files and security information.

Change-Id: If916cfe60e17913e1f147c3e3abadca20cd68784

Change-Id: I14b6becc908a0ac215769c32ee9c43db192ae6c8