drm/amdgpu: move more defines into amdgpu_irq.h

Everything that isn't related to the IH ring.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>