Features
   * All modules that use hashes or HMAC can now take advantage of PSA Crypto
     drivers when MBEDTLS_PSA_CRYPTO_C is enabled and psa_crypto_init() has
     been called. Previously (in 3.3), this was restricted to a few modules,
     and only in builds where MBEDTLS_MD_C was disabled; in particular the
     entropy module was not covered which meant an external RNG had to be
     provided - these limitations are lifted in this version. A new set of
     feature macros, MBEDTLS_MD_CAN_xxx, has been introduced that can be used
     to check for availability of hash algorithms, regardless of whether
     they're provided by a built-in implementation, a driver or both. See
     docs/driver-only-builds.md.
