More cleanup/fixes in mach-mr12.c

* Remove hardcoded speeds on eth0
* Work on trying to bringup the PCI WiFi Chip (Atheros 9280)
* Comment out eth1 PHY until we find it
	(chances are its on the internal switch)
* More documentation, probably unneeded

Signed-off-by: riptidewave93 <chrisrblake93@gmail.com>