v3dv: improve TLB layered image clears

v3dv: improve TLB layered image clears

Our meta image clearing code was emitting a job per layer to clear,
but we can emit a single job that packs multiple layer clears for
better performance. For this we just need to make sure we pass
the maximum layer we can emit to v3dv_job_start_frame so we
allocate sufficent tile state memory.

Actually, since this operation is TLB based and doesn't make use of
layered rendering, we could do with allocating less tile state
memory too. We will improve this for this and many others TLB meta
implementations in follow up patches.

Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11923>