Marvell Armada 370 and Armada XP Global Timers
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Required properties:
- compatible: Should be "marvell,armada-370-xp-timer"
- interrupts: Should contain the list of Global Timer interrupts
- reg: Should contain the base address of the Global Timer registers

Optional properties:
- marvell,timer-25Mhz: Tells whether the Global timer supports the 25
  Mhz fixed mode (available on Armada XP and not on Armada 370)