Core: Align with PSA FF specification 1.0-beta-0

- Renamed psa_error_t to psa_status_t
- All functions that accept or return signals now use the psa_signal_t
  type
- Removed PSA_CONNECTION_ACCEPTED and replaced its use in connection
  messages by PSA_SUCCESS
- Added PSA_CONNECTION_BUSY to indicate transient error conditions
  during calls to psa_connect() and renumbered the PSA error codes
- Removed psa_identity() and replaced it with client_id in psa_msg_t
- Renamed psa_end() to psa_reply()
- Combine psa_wait_any() and psa_wait_interrupt() into psa_wait().

Change-Id: Id3ba56f145a29aff297cc56e66810e0dbe0f913b
Signed-off-by: Edison Ai <edison.ai@arm.com>
Co-authored-by: Summer Qin <summer.qin@arm.com>
10 files changed