Marvell Orion SoC timer

Required properties:
- compatible: shall be "marvell,orion-timer"
- reg: base address of the timer register starting with TIMERS CONTROL register
- interrupt-parent: phandle of the bridge interrupt controller
- interrupts: should contain the interrupts for Timer0 and Timer1
- clocks: phandle of timer reference clock (tclk)

Example:
	timer: timer {
		compatible = "marvell,orion-timer";
		reg = <0x20300 0x20>;
		interrupt-parent = <&bridge_intc>;
		interrupts = <1>, <2>;
		clocks = <&core_clk 0>;
	};
