drm/amdgpu: move preamble IB handling into common code
This fixes the handling which was completely broken when you ad more than one preamble IB. Signed-off-by: NChristian König <christian.koenig@amd.com> Reviewed-by: NAlex Deucher <alexander.deucher@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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