irqchip: Add bcm2836 interrupt controller for Raspberry Pi 2

This interrupt controller is the new root interrupt controller with
the timer, PMU events, and IPIs, and the bcm2835's interrupt
controller is chained off of it to handle the peripherals.

I wrote the interrupt chip support, while Andrea Merello wrote the IPI
code.

Signed-off-by: Andrea Merello <[email protected]>
Signed-off-by: Eric Anholt <[email protected]>
Acked-by: Stephen Warren <[email protected]>
Cc: [email protected]
Cc: Lee Jones <[email protected]>
Cc: Jason Cooper <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>

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