Test: Add integration of the eRPC system

 - PSA Client API IDL file
 - Client and server init and API wrappers
 - Example client application

Signed-off-by: Kevin Peng <kevin.peng@arm.com>
Signed-off-by: Jamie Fox <jamie.fox@arm.com>
Signed-off-by: Summer Qin <summer.qin@arm.com>
Change-Id: If6180fd3e596c9daabd31262fb10ae0a1583bc9b
24 files changed