usb: musb_am335x: source cleanup

usb: musb_am335x: source cleanup

- remove comma after end of list delimiter
  The empty entry must always be the last item in the list, thus there
  is no point in having a trailing comma to facilitate adding
  succeding entries.
  Remove the comma, so that inadvertedly adding an entry after the end
  of list sentinel will produce a compile time error rather than an
  unreachable entry in the list.
- consistently use tabs for indentation

Conflicts:
	drivers/usb/musb/musb_am335x.c