tls: psa_pake: remove useless defines and fix a comment

Signed-off-by: Valerio Setti <vsetti@baylibre.com>
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index 7b51040..5bfdde7 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -8260,13 +8260,8 @@
             ++step )
         {
             /*
-             * For each step, prepend 1 byte with the length of the data.
-             *
-             * NOTE = psa_pake_output() sometimes output elements which are
-             * NOT 32 or 65 bytes as expected, but 1 byte less. So, instead
-             * of hardcoding the expected length, we
-             * - get the output first
-             * - then write the length of this output
+             * For each step, prepend 1 byte with the length of the data as
+             * given by psa_pake_output().
              */
             status = psa_pake_output( pake_ctx, step,
                                         buf + output_offset + 1,