i8239: Introduce per-PIC output interrupt
As a first step towards more generic master-slave support, remove parent_irq in favor of a per-PIC output interrupt line. The slave's line is attached to IRQ2 of the master, but it remains unused for now. Signed-off-by: NJan Kiszka <jan.kiszka@siemens.com> Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>
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