mvebu dt for 4.5 (part 3)

Add dts for the following boards:
- Zyxel NSA325
- PogoPlug series 4
Add GPU support for Dove
Update boolean property to wakeup source for isil

* tag 'mvebu-dt-4.5-3' of git://git.infradead.org/linux-mvebu:
  ARM: dts: armada: replace isil, irq2-can-wakeup-machine with wakeup-source property
  ARM: dts: enable GPU for SolidRun's Cubox
  ARM: dts: dove: add DT GPU support
  ARM: mvebu: kirkwood: add PogoPlug series 4 device tree
  ARM: mvebu: add kirkwood compatibles for cloudengine boards
  ARM: dts: kirkwood: Add DTS for Zyxel NSA325
Signed-off-by: Olof Johansson <olof@lixom.net>