chtls: fix tp->rcv_tstamp initialization

tp->rcv_tstamp should be set to tcp_jiffies, not tcp_time_stamp().

Fixes: cc35c88a ("crypto : chtls - CPL handler definition")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Ayush Sawal <ayush.sawal@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>