Revert "radv: detect command buffers that do no work and drop them (v2)"

This just keeps popping up minor problems and regressions we should
revisit in a more sustainable manner later.

This also reverts:
Revert "radv: query cmds should mark a cmd buffer as having draws."
Revert "radv: also fixup event emission to not get culled."

This reverts commit d1640e7932.
This reverts commit 8b47b97215.
This reverts commit b4b19afebe.

Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Signed-off-by: Dave Airlie <airlied@redhat.com>

src/amd/vulkan/si_cmd_buffer.c

@@ -923,7 +923,7 @@ static void si_emit_cp_dma_clear_buffer(struct radv_cmd_buffer *cmd_buffer,
 static void si_cp_dma_prepare(struct radv_cmd_buffer *cmd_buffer, uint64_t byte_count,
 			      uint64_t remaining_size, unsigned *flags)
 {
-	cmd_buffer->no_draws = false;
+
 	/* Flush the caches for the first copy only.
 	 * Also wait for the previous CP DMA operations.
 	 */