add more features like DUPLEX, 100MB link speed etc to auto negotiate
in EMAC driver. EMAC controller autonegotiates for these features with
PHYs which are on the board.

Signed-off-by: Sudhakar Rajashekhara <sudhakar.raj@ti.com>
Signed-off-by: Manjunath Hadli <manjunath.hadli@ti.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>