[ARM] pxa/viper: convert to use plat_serial8250_port irqflags field
Use .irqflags in the plat_serial8250_port structure to set IRQ polarity, and get rid of the corresponding set_irq_type(). Signed-off-by: NMarc Zyngier <maz@misterjones.org> Signed-off-by: NEric Miao <eric.y.miao@gmail.com>
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