mvebu dt changes for v4.3 (part #2)

Add support Buffalo Linkstation LS-WTGL

* tag 'mvebu-dt-4.3-2' of git://git.infradead.org/linux-mvebu:
  ARM: dts: orion5x: add buffalo linkstation ls-wtgl
Signed-off-by: Olof Johansson <olof@lixom.net>