samples: tfm_secure_partition: fix build of the ARoT

With the update of MbedTLS to 3.6.0 the configuration files
(mbedtls/mbedtls_config.h, psa/crypto_config.h)
are not found anymore by default.

Make the ARoT's CMake target inherit from psa_crypto_config;
it defines what is needed to find the MbedTLS
configuration files.

Signed-off-by: Tomi Fontanilles <tomi.fontanilles@nordicsemi.no>