Remove USE_PSA references from SSL documentation

MBEDTLS_USE_PSA_CRYPTO is now always enabled we need to update the
documentation accordingly.

Signed-off-by: Janos Follath <janos.follath@arm.com>
diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index 9353eb4..fff5339 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -1984,9 +1984,8 @@
  *                 Calling mbedtls_ssl_setup again is not supported, even
  *                 if no session is active.
  *
- * \note           If #MBEDTLS_USE_PSA_CRYPTO is enabled, the PSA crypto
- *                 subsystem must have been initialized by calling
- *                 psa_crypto_init() before calling this function.
+ * \note           The PSA crypto subsystem must have been initialized by
+ *                 calling psa_crypto_init() before calling this function.
  *
  * \param ssl      SSL context
  * \param conf     SSL configuration to use
@@ -4920,10 +4919,8 @@
  *                 currently being processed might or might not contain further
  *                 DTLS records.
  *
- * \note           If the context is configured to allow TLS 1.3, or if
- *                 #MBEDTLS_USE_PSA_CRYPTO is enabled, the PSA crypto
- *                 subsystem must have been initialized by calling
- *                 psa_crypto_init() before calling this function.
+ * \note           The PSA crypto subsystem must have been initialized by
+ *                 calling psa_crypto_init() before calling this function.
  */
 int mbedtls_ssl_handshake(mbedtls_ssl_context *ssl);