net/fec: clean suspend/resume

Commit 59d4289b converted fec to dev_pm_ops but
didn't update the suspend/resume functions thus leading to the following warning :
"initialization from incompatible pointer type" when CONFIG_PM is set.

This patch also fixe a few indentation and style around CONFIG_PM area.

Signed-off-by: Eric Bénard <eric@eukrea.com>
Cc: netdev@vger.kernel.org
Cc: davem@davemloft.net
Cc: amit.kucheria@canonical.com
Cc: s.hauer@pengutronix.de
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: David S. Miller <davem@davemloft.net>