ramips: assign LEDs for RAVPower RP-WD03

ramips: assign LEDs for RAVPower RP-WD03

According to the User Manual, there is a "Wi-Fi LED" with blue and
green colors, doing the following by default:

  Flashing Blue: System loading
  Solid Blue: System loaded
  Flashing Green: Connecting to the Internet
  Solid Green: Connected to the Internet

According to this vendor behavior, we keep refer to the LED as "wifi"
but implement the according default behavior as in OEM firmware.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>