UPSTREAM: stmmac: do not sleep in atomic context for mdio_reset

UPSTREAM: stmmac: do not sleep in atomic context for mdio_reset

stmmac_mdio_reset() has been updated to use msleep rather udelay
(as some PHY requires a one second delay there).
It called from stmmac_resume() within the spin_lock_irqsave block
atomic context triggering 'scheduling while atomic'.

The stmmac_priv lock usage is not fully documented, but it seems
to protect the access to the MAC registers / DMA structures rather
than the MDIO bus or the PHY (which have separate locking),
so we can push the spin_lock after the stmmac_mdio_reset call.

Change-Id: I0e8a0f7e798f89678d59eefdfd251f217c00787e
Signed-off-by: Vincent Palatin <vpalatin@chromium.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Huang, Tao <huangtao@rock-chips.com>
(cherry picked from commit f55d84b07c4e7340473a25dc82b462607578402c)