PSA Crypto contains multi-part APIs.
These APIs require the context to be preserved between repetitive psa_call() invocations.
Typically the context is allocated on PSA_IPC_CONNECT and destroyed during PSA_IPC_DISCONNECT events.
The context is saved in r_handle.
Current TF-M implementation does not allow calling psa_set_rhandle during PSA_IPC_CONNECT before psa_reply() is called.
This issue is a blocker issue for mbed-os team.