Venus: Add VN_CMD_ENQUEUE macro with vkCmd* common code
Several `vn_Cmd` share the same code to enqueue the command to the command stream. This adds a macro with this common code. Signed-off-by: Igor Torrente <igor.torrente@collabora.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15344>
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