Add a generic mmio gpio controller based driver and probe it
through device tree.
Use aliases for base calculation until we converted all users to
device tree or named gpios.
Convert bcm63xx_enet's ephy-reset gpio to use a named gpio.
While at it, remove the duplicate reset gpio defintion for livebox.
Signed-off-by: Jonas Gorski <jogo@openwrt.org>
SVN-Revision: 44565
