cnic: Update version to 2.5.20 and copyright year.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --cc drivers/net/ethernet/broadcom/cnic.c
Simple merge

diff --cc drivers/net/ethernet/broadcom/cnic.h
Simple merge

diff --cc drivers/net/ethernet/broadcom/cnic_defs.h
Simple merge

diff --cc drivers/net/ethernet/broadcom/cnic_if.h
Simple merge