irqchip/armada-370-xp: Refactor mpic_handle_msi_irq() code

Refactor the mpic_handle_msi_irq() function to make it simpler:
- drop the function arguments, they are not needed
- rename the variable holding the doorbell cause register to "cause"
- rename the iterating variable to "i"
- use for_each_set_bit() (requires retyping "cause" to unsigned long)

Signed-off-by: Marek Behún <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Andrew Lunn <[email protected]>
Reviewed-by: Ilpo Järvinen <[email protected]>
Link: https://lore.kernel.org/all/[email protected]

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