devices: the trait bound `DummyIrqChip: GICDevice/AIADevice` is not satisfied

[peppergrayxyz]

Build fails on arch64 (#429):

Compiling devices v0.1.0
error[E0277]: the trait bound `DummyIrqChip: GICDevice` is not satisfied
   --> src/devices/src/legacy/irqchip.rs:171:23
    |
171 |     impl IrqChipT for DummyIrqChip {
    |                       ^^^^^^^^^^^^ the trait `GICDevice` is not implemented for `DummyIrqChip`
    |
    = help: the following other types implement trait `GICDevice`:
              KvmGicV2
              KvmGicV3
              irqchip::IrqChipDevice
note: required by a bound in `irqchip::IrqChipT`
   --> src/devices/src/legacy/irqchip.rs:127:33
    |
127 | pub trait IrqChipT: BusDevice + GICDevice {
    |                                 ^^^^^^^^^ required by this bound in `IrqChipT`

and RISC-V:

Compiling devices v0.1.0
error[E0277]: the trait bound `DummyIrqChip: AIADevice` is not satisfied
   --> src/devices/src/legacy/irqchip.rs:191:23
    |
191 |     impl IrqChipT for DummyIrqChip {
    |                       ^^^^^^^^^^^^ the trait `AIADevice` is not implemented for `DummyIrqChip`
    |
    = help: the following other types implement trait `AIADevice`:
              KvmAia
              irqchip::IrqChipDevice
note: required by a bound in `irqchip::IrqChipT`
   --> src/devices/src/legacy/irqchip.rs:138:33
    |
138 | pub trait IrqChipT: BusDevice + AIADevice {
    |                                 ^^^^^^^^^ required by this bound in `IrqChipT`