Core: add PSA client API functions

NS client infrastructure for PSA API created in
conformance with v8M secure gateway call restrictions
and TF-M rules.

Note:
- S SVC handlers TBD
- Buffer read/write funtions TBD
- Sanity checks in S SVC handlers TBD

Change-Id: Ia2947c28247af699d337754db2f22e2e25235c41
Signed-off-by: Miklos Balint <miklos.balint@arm.com>
8 files changed