irqchip/mvebu-gicp: Use level-triggered MSIs between ICU and GICP

The ICU and GICP drivers are using an ugly side-band mechanism to
find out about the "clear" doorbell when using level interrupts.

Let's convert it to level-triggered MSIs, which result in a nice
cleanup.

Signed-off-by: Marc Zyngier <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Tested-by: Miquel Raynal <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: Jason Cooper <[email protected]>
Cc: Ard Biesheuvel <[email protected]>
Cc: Srinivas Kandagatla <[email protected]>
Cc: Thomas Petazzoni <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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