This patch modifies the 5704S hardware autoneg code to use the
administrator specified flow control parameters.  Since the 5704S uses
device specific flow control enumerations, the 1000-BaseX utility
functions are used and code was added to convert the definitions to and
from the proprietary enumerations.

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