Align PSA IPC caller with the new RPC design

Implement dummy rpc_caller_interface in PSA IPC caller and export an
interface which matches the openamp functions.

Signed-off-by: Imre Kis <imre.kis@arm.com>
Change-Id: Iaf30d1fe4607cc4e04c8859524eabe2d0f6bb31b
4 files changed