vulkan: Unconditionally add barriers for missing external subpass deps
This is a very scorched-earth approach which doesn't take into account whether or not there are any explicitly provided dependencies. We could take a finer-grained approach in theory but it's unlikely to matter in practice since you usually stall in Begin/EndRenderPass anyway. Fixes: 1d726940 ("vulkan: Add a common CmdBegin/EndRederPass implementation") Closes: mesa/mesa#6203 Closes: mesa/mesa#7650 Reviewed-by:Lionel Landwerlin <lionel.g.landwerlin@intel.com> Part-of: <mesa/mesa!19599> (cherry picked from commit 11b2a063)