ARM: imx: Explicitly pass the active level of the PHY reset

ARM: imx: Explicitly pass the active level of the PHY reset

Since commit 7a399e3a2e (fec: Do not assume that PHY reset is active low), we no
longer assume that the PHY reset is active low.

Now we need to retrieve this information from the device tree instead.

Passing '0' as the phy-reset-gpios means 'active high' according to the
definition from include/dt-bindings/gpio/gpio.h:

, so in order to keep things working as before we need to explicitly pass
GPIO_ACTIVE_LOW as the flag.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Olof Johansson <olof@lixom.net>