ipsec: Revert "ipsec: fix chained ESP"

This reverts commit c2c1bfd9b72aec88526c06479b128725eb525866.

Reason for revert: Seems it's breaking ipsec esp tests

Type: fix

Change-Id: Iac590eee23cbf92a10c62dafa789aa9c3b2284dd
Signed-off-by: Florin Coras <fcoras@cisco.com>
diff --git a/test/test_ipsec_esp.py b/test/test_ipsec_esp.py
index cd5a88c..5b057e7 100644
--- a/test/test_ipsec_esp.py
+++ b/test/test_ipsec_esp.py
@@ -509,10 +509,9 @@
                            count=NUM_PKTS)
 
         LARGE_PKT_SZ = [
-            1970,  # results in 2 chained buffers entering decrypt node
-                   # but leaving as simple buffer due to ICV removal (tra4)
             4010,  # ICV ends up splitted accross 2 buffers in esp_decrypt
                    # for transport4; transport6 takes normal path
+
             4020,  # same as above but tra4 and tra6 are switched
         ]
         if self.engine in engines_supporting_chain_bufs: