net: merge bugfix: Marvell Kirkwood gigabit ethernet driver

This patch looks okay on u-boot-net.git/next branch
but when it was merged to u-boot.git/master the last line is missing

Signed-off-by: Prafulla Wadaskar <prafulla@marvell.com>
Acked-by: Ben Warren <biggerbadderben@gmail.com>