Revert "radv: do not emit PKT3_CONTEXT_CONTROL with AMDGPU 3.6.0+"

This reverts commit 2ca8629f.

This was initially ported from RadeonSI, but in the meantime it has
been reverted because it might hang. Be conservative and re-introduce
this packet emission.

Unfortunately this doesn't fix anything known.

Cc: 19.2 <mesa-stable@lists.freedesktop.org>
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
(cherry picked from commit 4a3bdc6d)