atusb.brd: updated balun footprint
atusb.brd: updated balun footprint

- atusb.brd: updated 0805-6 footprint of the balun and rearranged its
  surroundings accordingly

cfriedt/ben-wpan,cfriedt/ben-wpan,cfriedt/ben-wpan,cfriedt/ben-wpan,cfriedt/ben-wpan,cfriedt/ben-wpan