bnx2x: Unify PHY attributes

Start building the infrastructure for dual media by adding new component
of PHY which will be used all along the function. Modify function to
work with this component instead of the link_params.

Signed-off-by: Yaniv Rosner <yanivr@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>