KVM: MIPS: Add more types of virtual interrupts

In current implementation, MIPS KVM uses IP2, IP3, IP4 and IP7 for
external interrupt, two kinds of IPIs and timer interrupt respectively,
but Loongson-3 based machines prefer to use IP2, IP3, IP6 and IP7 for
two kinds of external interrupts, IPI and timer interrupt. So we define
two priority-irq mapping tables: kvm_loongson3_priority_to_irq[] for
Loongson-3, and kvm_default_priority_to_irq[] for others. The virtual
interrupt infrastructure is updated to deliver all types of interrupts
from IP2, IP3, IP4, IP6 and IP7.

Reviewed-by: Aleksandar Markovic <[email protected]>
Signed-off-by: Huacai Chen <[email protected]>
Co-developed-by: Jiaxun Yang <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>

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