These are unneeded. Events can't be used to indefinitely stall work
like you can with a semaphore or timeline semaphore. The signals
still need to happen so that execution will modify the state that
can be polled from the CPU though.
Fixes dEQP-VK.synchronization.basic.event.single_submit_multi_command_buffer
Fixes: 04fa6c71 ("dzn: Batch command lists together")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22842>