[mbed-tls] Driver only build option

Hi,

I am trying to use the MACRO's defined at - https://github.com/Mbed-TLS/mbedtls/blob/development/docs/driver-only-builds... to enable driver only build.

As mentioned on the page I tried to do this for SHA256. However, the code in sha256.c isn't ifdefed by "MBEDTLS_PSA_ACCEL_ALG_SHA_256" so still gets compiled ?

Can you point me to what I am missing here ?

Regards, Ruchika