staging: octeon-ethernet: move ndo_stop to common init

All init functions call ndo_stop if it's defined, so move it
to common function.

Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --cc drivers/staging/octeon/ethernet-rgmii.c
Simple merge

diff --cc drivers/staging/octeon/ethernet-sgmii.c
Simple merge

diff --cc drivers/staging/octeon/ethernet-xaui.c
Simple merge

diff --cc drivers/staging/octeon/ethernet.c
Simple merge