We've got bug reports with
vkr: vkExecuteCommandStreamsMESA resulted in CS error
and nothing else.
As far as I can tell, the decoder, the encoder, and vn_dispatch_command
all log on CS errors. The problem should be in
vkr_dispatch_vkExecuteCommandStreamsMESA. Make
vkr_dispatch_vkExecuteCommandStreamsMESA chatty as well.
Part-of: <https://gitlab.freedesktop.org/virgl/virglrenderer/-/merge_requests/722>