Add RSS Communication Protocol components

The Corstone-1000 platform uses RSS Communication Protocol
to communicate between the Secure Enclave and the Host processor.

This uses the previously copied RSS Comm Protocol-related files
and has minor modifications to make them work correctly in
Trusted Services. Currently, only the Embed Protocol is supported
from the RSS Comms.

A new messaging and RPC component was made, and both of them follows the
previous OpenAMP and psa_ipc components' structures.

Modified the SE-Proxy deployment to use this new protocol instead of
the OpenAMP.

Signed-off-by: Bence Balogh <bence.balogh@arm.com>
Change-Id: Ia0d2c71396006404f28b8f1338dbbb939237cf62
20 files changed