[ARM] mmp2: fix incorrect calling of chip->mask_ack() for 2nd level cascaded IRQs
The irq_chip is not yet registered, so no default irq_chip.mask_ack(), which we have to handle it correctly manually here. Signed-off-by: NHaojian Zhuang <haojian.zhuang@marvell.com> Signed-off-by: NEric Miao <eric.y.miao@gmail.com>
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