modules: tf-m: fix tfm_api's configuration of MbedTLS

The configuration file was not passed down to tfm_api, which
made the compilation of (at least) interface/src/tfm_crypto_api.c
fail when updating MbedTLS to 3.6.0.

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