irqchip: mtk-sysirq: Get irq number from register resource size

Originally mtk-sysirq hardcoded supported irq number to 224. This
was fine since all SoCs before support the same number of irqs for
intpol.

However MT8173 intpol support 32 more irq pins, changes to get
irq number from register resource size to suppor MT8173 properly.

Signed-off-by: Yingjoe Chen <[email protected]>
Signed-off-by: Eddie Huang <[email protected]>
Cc: <[email protected]>
Cc: Pawel Moll <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Ian Campbell <[email protected]>
Cc: Kumar Gala <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Olof  Johansson <[email protected]>
Cc: Robert Richter <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: <[email protected]>
Cc: Sascha Hauer <[email protected]>
Cc: <[email protected]>
Cc: <[email protected]>
Cc: Matthias Brugger <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: Jason Cooper <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>

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