drm/amdgpu: add nbif v7_4 irq source header for vega20
nbif v7_4 interrupt source definition
Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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