Remove usage of old crypto options in public headers

The remaining occurences were related to
dead code.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/library/debug_internal.h b/library/debug_internal.h
index 3ffcee1..79a4c45 100644
--- a/library/debug_internal.h
+++ b/library/debug_internal.h
@@ -73,9 +73,7 @@
 
 #if defined(MBEDTLS_BIGNUM_C)
 /**
- * \brief   Print a MPI variable to the debug output. This function is always
- *          used through the MBEDTLS_SSL_DEBUG_MPI() macro, which supplies the
- *          ssl context, file and line number parameters.
+ * \brief   Print a MPI variable to the debug output.
  *
  * \param ssl       SSL context
  * \param level     error level of the debug message