MIPS/Malta: Probe gic-timer via devicetree

The Malta platform is the only platform remaining to probe the GIC
clocksource via gic_clocksource_init. This route hardcodes an expected
virq number based on MIPS_GIC_IRQ_BASE, which can be fragile to the
eventual virq layout. Instread, probe the driver using the preferred and
more modern devicetree method.

Before the driver is probed, set the "clock-frequency" property of the
devicetree node to the value detected by Malta platform code.

Signed-off-by: Matt Redfearn <[email protected]>
Cc: [email protected]
Cc: James Hogan <[email protected]>
Cc: Daniel Lezcano <[email protected]>
Cc: Ralf Baechle <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>

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