DMA ops are not shown as events

[farnoy]

Initially reported for RADV at https://gitlab.freedesktop.org/mesa/mesa/-/issues/9720, includes traces captured from AMDVLK & RADV showing the difference

But the difference in behavior is just due to RADV using DMA ops some of the time to fill buffers, and AMDVLK always using CS which gets shown by RGP just fine. The case in point was a vkCmdResetQueryPool call, but it probably also happens with vkCmdFillBuffer and others.

My suggestion is to show these DMA operations in the Events view at least. I understand they won't be first-class citizens and they can't show any wavefronts, but not having them represented at all can leave gaps in the timeline.