Because of the incorrectly supported SGMII_2500 mode, this patch
disables eth2 for now until this issue will be fixed in mainline.
Also fix an incorrect comment.
Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Konstantin Porotchkin <kostap@marvell.com>
Cc: Stefan Chulski <stefanc@marvell.com>
Cc: Nadav Haklai <nadavh@marvell.com>
Cc: Marek Behun <marek.behun@nic.cz>