psa: Remove outdated comments

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index ecb00f0..3ba056d 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -3165,7 +3165,6 @@
       .core = slot->attr
     };
 
-    /* Try any of the available accelerators first */
     status = psa_driver_wrapper_sign_hash(
         &attributes, slot->key.data, slot->key.bytes,
         alg, hash, hash_length,
@@ -3262,7 +3261,6 @@
       .core = slot->attr
     };
 
-    /* Try any of the available accelerators first */
     status = psa_driver_wrapper_verify_hash(
         &attributes, slot->key.data, slot->key.bytes,
         alg, hash, hash_length,