Manually fix two remaining instances of old macros

Unless I missed something, all remaining instance of all macros are in
files where it makes sense to use these. I went over the output of:

    git grep -c -E 'MBEDTLS_(MD5|RIPEMD160|SHA[0-9]*)_C'

and I think all the files listed fall into one of the following
acceptable categories:

- documentation and historical documents: Changelog, docs/**/*.md
- config files and related: mbedtls_config.h, configs/*.h,
  check_config.h, config_psa.h, etc.
- scripts that build/modify configs: all.sh, depends.py,
  set_psa_test_dependencies.py, etc.
- implementation of MD or PSA or related: md.h, psa_util.h, etc. and
  corresponding test suites
- implementation of hashes: md5.c, sha256.h, etc. and corresponding test
  suites
- two example programs using a low-level hash API: hash/hello.c,
  pkey/ecdsa.c
- test/benchmark.c, test/selftest.c: actually want our built-in
  implementations
- a function in test_suite_psa_crypto_storage_format that is
  specifically for checking if the hash is built in.

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
diff --git a/tests/include/test/psa_exercise_key.h b/tests/include/test/psa_exercise_key.h
index eb69fc6..b5e3d35 100644
--- a/tests/include/test/psa_exercise_key.h
+++ b/tests/include/test/psa_exercise_key.h
@@ -34,7 +34,7 @@
  */
 #if defined(PSA_WANT_ALG_MD5)
 #define KNOWN_SUPPORTED_HASH_ALG PSA_ALG_MD5
-/* MBEDTLS_RIPEMD160_C omitted. This is necessary for the sake of
+/* PSA_WANT_ALG_RIPEMD160 omitted. This is necessary for the sake of
  * exercise_signature_key() because Mbed TLS doesn't support RIPEMD160
  * in RSA PKCS#1v1.5 signatures. A RIPEMD160-only configuration would be
  * implausible anyway. */