net: macb: Add support for phy reset using gpio

net: macb: Add support for phy reset using gpio

Added phy reset functionality using the gpio. This patch assumes that the phy
reset involves an active high/low pulse for certain duration. So, it expects
device tree parameters for reset pulse duration and reset active low or active
high state.

The flags, when requesting gpio for phy reset, should have direction
reflected in bit 0 (as out) and active low/high reflected in bit 1.
Currently these flags are wrong in the driver. Correct this to use
the GPIOF_OUT_INIT_* definitions already available.

Signed-off-by: Punnaiah Choudary Kalluri <punnaia@xilinx.com>
Signed-off-by: Harini Katakam <harinik@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>