Add common RPC interface components

Add rpc_status_t, service_status_t and rpc_uuid definitions which are
intended to be used across different RPC implementations and in both
client and endpoint code.

Signed-off-by: Imre Kis <imre.kis@arm.com>
Change-Id: Icba3c7098657cde2904fe94e7154610253ad2438
4 files changed