atheros: dragino: Reset pin is on a different gpio

atheros platform does not have multi board support in openwrt. Make this
repository contain hardcoded support for the "dragino" version of
atheros.

Signed-off-by: Karl Palsson <karlp@remake.is>
atheros: dragino: hardcode LEDs.

OpenWrt doesn't have broken out archs for the atheros platform
unfortunately.  This patch, originally from:
https://github.com/flukso/flm02/blob/develop/openwrt/patches/310-register_gpio_leds.patch
makes the "atheros" target permanently match the Dragino MS12 platform.
(along with 502-reset-button-switcharoo.patch)

This has been refreshed to be a patch against 3.10, in BB branch
atheros: hack hardcode rs485 via gpio

Add hardcoded hack for toggling TX Enable pin on RS485 transceiver