Should only set once outside the multidraw loop so that per draw can
patch its own own desc attribs when needed.
Fixes: a5a0dd3ccc ("panvk: Implement multiDrawIndirect for v10+")
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Acked-by: Christoph Pillmayer <christoph.pillmayer@arm.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37951>