tests/bsim/bluetooth/mesh/overlay_psa.conf

# The option adds TinyCrypt based bt_rand.
CONFIG_BT_HOST_CRYPTO=n
# The option adds GATT caching feature that is based on TinyCrypt.
CONFIG_BT_GATT_CACHING=n

# Enable mbedTLS PSA as a crypto backend
CONFIG_BT_MESH_USES_MBEDTLS_PSA=y