SPM: Rename PSA API source and header filename

- Rename "psa_client_service_apis.c(h)" to "psa_api_svc.c(h)",
  They are for the SVC handler of PSA APIs and only used by SVC
  handler.
- Rename "spm_psa_client_call.c(h)" to "psa_api.c(h)",
  They are for the PSA APIs' function body and can be called by the
  clients or services when there is no boundary.

Change-Id: If90e658e1b055c66f11a696cd4f8a691a38f4964
Signed-off-by: Mingyang Sun <mingyang.sun@arm.com>
7 files changed