etnaviv: flush VS texture cache when texture data is changed

etnaviv: flush VS texture cache when texture data is changed

If a sampler resource is changed the vertex texture caches also need to
be flushed, as those are separate from the fragment texture caches.

It seems that some cores need the VS sampler cache flush to be in a
separate state. I have seen no adverse effects of merging the TEXTUREVS
flush into a single flush state emission on GC3000 and up, but the blob
always emits the vertex sampler cache flush as a separate state, so do
the same here to avoid nasty surprises.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22104>