ar71xx: move TL-WA801ND v2 setup code

The TL-WA801ND v2 board has only one LAN port which makes
it more similar to the TL-WR[78]50RE devices. Move the
board setup code into the mach-tl-wax50re.c file.

Based-on: http://patchwork.openwrt.org/patch/4506/


Signed-off-by: Martijn Zilverschoon <thefriedzombie@gmail.com>
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

SVN-Revision: 39072