I figured out that I need to enter the MAC Address of the then assign an ip address to it. However, something is randomizing the MAC Address every time I reboot the pi.
Edit:
I think I has figured out what is randomizing the MAC Address... OpenWrt! Going to "Network" -> "Wireless" -> (device name) -> "Edit" -> "Advanced" (under Interface Configuration) and manually entering a MAC Address then saving and applying seems to do the trick.