The driver module needs to be described through a JSON file description that gets parsed by the mbedTLS build system to link the driver entry points into the psa_crypto_driver_wrapper.
This is not yet supported by mbedTLS backend so keep this task as a low priority placeholder for the time being.
The mbed TLS work is tracked here: https://github.com/Mbed-TLS/mbedtls/pull/5396
Until this is completed and available in a released version of mbed TLS, this task can't progress.