r600: Use TRUNC_COORD on samplers

As per d573d1d82524b8a2e5f56938069cabc0f0176a0e the same should be done
here. It seems like TRUNCATE_COORD not available on r600, so this is
limited to evergreen.

Reviewed-by: Gert Wollny <gert.wollny@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5078>
1 file changed