st/nine: Force DYNAMIC SYSTEMMEM for sw vertex processing

st/nine: Force DYNAMIC SYSTEMMEM for sw vertex processing

SW vertex processing buffers are supposed to be sorted in RAM
and to be immediately idle after use (thus you can write at the
same location again immediately).

DYNAMIC SYSTEMMEM is by far the best fit for now for these kind
of buffers, though it can be improved further. Indeed the use
pattern will cause a lot of syncs with csmt actived.
Thus disable csmt when full sw vertex processing is requested.

Signed-off-by: Axel Davy <davyaxel0@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9451>