drm/amdgpu: add DMUB outbox event IRQ source define/complete/debug flag

[Why & How]
We use outbox interrupt that allows us to do the AUX via DMUB
Therefore, we need to add some irq source related de

drm/amdgpu: add DMUB outbox event IRQ source define/complete/debug flag

[Why & How]
We use outbox interrupt that allows us to do the AUX via DMUB
Therefore, we need to add some irq source related definition
in the header files;

Signed-off-by: Jude Shih <[email protected]>
Reviewed-by: Harry Wentland <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

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