ARM: dts: kirkwood: gpio-leds fixes for linkstation ls-wvl/vl

The GPIOs controlling the LEDs, listed below, are active high, not low:
  - gpio-leds: "lswvl:red:alarm" pin
  - gpio-leds: "lswvl:red:func" pin
  - gpio-leds: "lswvl:amber:info" pin
  - gpio-leds: "lswvl:blue:func" pin
  - gpio-leds: "lswvl:red:hdderr{0,1}" pin

Fixes: c43379e1

 ("ARM: dts: add buffalo linkstation ls-wvl/vl")
Signed-off-by: Roger Shimizu <rogershimizu@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>