panfrost: Clamp pure int pixels

We need saturate, not wrap semantic. Could optimize to a .isat/.usat
modifier but that's for future.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5755>
1 file changed