irqchip/mips-gic: Remove device IRQ domain

In commit c98c1822ee13 ("irqchip/mips-gic: Add device hierarchy domain")
Qais indicates that he felt having a separate device IRQ domain was
cleaner, but along with everyone else I'm aware of touching this driver
I disagree.

Remove the separate device IRQ domain so that we simply have the main
GIC IRQ domain used for devices, and an IPI IRQ domain as a child. The
logic for handling the device interrupts & IPIs is cleanly separated
into the appropriate domain ops, making it much easier to reason about
what the driver is doing than the previous approach where the 2 child
domains had to call up to their parent, which had to handle both types
of interrupt & had all sorts of weird & wonderful duplication or
outright clobbering of setup performed by multiple domains.

Signed-off-by: Paul Burton <[email protected]>
Signed-off-by: Matt Redfearn <[email protected]>
Cc: [email protected]
Cc: Jason Cooper <[email protected]>
Cc: Marc Zyngier <[email protected]>
Cc: Ralf Baechle <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>

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