ARM i.MX avic: convert to use generic irq chip
Convert i.MX avic irq handler to use generic irq chip. This not only provides a cleanup implementation of irq chip handler, but also implements suspend/resume interface with the help of generic irq chip interface. Change mxc_irq_chip to a new structure mxc_extra_irq to handle fiq and priority functions. Signed-off-by: NHui Wang <jason77.wang@gmail.com> Acked-by: NShawn Guo <shawn.guo@linaro.org> Signed-off-by: NSascha Hauer <s.hauer@pengutronix.de>
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